Penny

Penny is the show's main female protagonist. She lives in apartment 4B across the hall from Leonard Hofstadter and Sheldon Cooper, who live in apartment 4A. Her full first name is possibly "Penelope" as implied by "The Barbarian Sublimation", and her has not been given so far though for four years she was technically Penny Johnson when accidently married to Zack Johnson.

An aspiring but mostly unsuccessful, she was born on a farm near , Nebraska, and worked at The Cheesecake Factory as a until she quits it in The Occupation Recalibration  (S7E13) to take up acting full time. Penny was the original female lead in the show before being joined by Bernadette Rostenkowski and Amy Farrah Fowler.

She has been Leonard's love interest for most of the show, with the two briefly in the first episode of the second season, for most of the third season, and they rekindled their romance in "The Recombination Hypothesis". Penny is good friends with Leonard (despite their rocky relationship) and Sheldon, and even though she is considered part of the guys' group, she represents the "dumb blonde" for viewer context in the series.

Origin and Development
Originally, two different female leads were written for the pilot episode. The unaired pilot episode had an alternate version of the female lead named Katie. Katie was bitter and received by s to be too mean to Sheldon and Leonard. Kaley Cuoco did not portray this alternate version of the female lead, but instead was hired to do the second version filmed after the unaired pilot, which was sociable and nice and was the one that the producers decided was the more interesting and appealing out of the two.

Some of Penny's comedic role in the series is rooted in her ability to execute practical and simple solutions to problems of which the guys try to solve through complicated or means. For example, in the episode The Pants Alternative, Sheldon reveals that in spite of his ability to talk excessively to people in small groups, he has a severe case of, and wouldn't be able to accept an. While Leonard tries to get to the root of his problem through a psych evaluation, and Raj attempts to use, Penny solves the problem by buying him a new and getting him  right before he needs to make his speech.

As the series developed, Penny's character took on the theme of being the virtual polar opposite of Sheldon, which created a unique relationship between the two characters. Penny's relationship with the other guys is usually perceived as something of an older, or a in some cases with Sheldon. She has also had a romantic, on-and-off relationship with Leonard.



Physical Appearance
Penny is 5'6" (1.68 m), with hair and green . Her most distinguishing features are her disposition, hair, eyes, smile, and slender  body. Her includes casual sportswear, her Cheesecake Factory uniform, and glamorous evening gowns. Regardless of attire, her wardrobe, makeup, and accessories highlight her best attributes. It's revealed that she has the Chinese character for "courage" tattooed on her right butt cheek, though according to Sheldon the character means "soup."

Initially, her taste in clothes included short-shorts, low-cut tops, and bare midriffs, but over the course of the show, it evolved into more modest and flattering and pants as she got older. Her varies, originally being long and straight, but is currently curly and a darker shade. It has occasionally been put up in a or pigtails, but normally hangs untied. Also it hinted that Penny may not be a natural blonde. In "The Date Night Variable " she protests that her blonde hair is her natural hair color, but when Amy looks at her confusedly, she finishes "...now...".

Background
When she first met the guys in the pilot, Penny was writing a about a girl from, who travels to  to become an actress, but ends up working at The Cheesecake Factory instead. When Leonard asks if the screenplay was autobiographical, she replies that it isn't, because she is from a small town outside of Omaha, Nebraska.

Penny moved into the apartment building because she split with her boyfriend of 4 years, Kurt. She says she still loved him, and insinuates he cheated on her. The shower in her apartment was broken at the time, so the boys offered her theirs. Her apartment is sloppy and disorganized, but Penny appears to like it that way.

She is either oblivious to or completely aware of her effect on the boys, because within minutes of meeting him, she asked Leonard to retrieve her set from Kurt's apartment, which he immediately set out to do. Penny is aware of Leonard's crush on her, and it is hinted throughout the series that some of the feelings are reciprocated. At the end of season one, Penny goes on a date with Leonard. Leonard is very nervous, and Penny slightly withdrawn, but they nonetheless share a kiss.

In season two, there was some initial enthusiasm between Penny and Leonard. However, they later develop insecurities concerning their relationship. Penny was worried that she was not smart enough for Leonard, and lied about graduating from because she thought it would make Leonard respect her. The relationship quickly deteriorated and she goes back to dating different guys. Leonard showed Penny some on Pasadena City College and she interpreted it as him wanting a girl with more  and they break up.

She gives relationship advice to Sheldon and Leonard fairly often: Leonard, when he has problems with Priya or Stephanie, and Sheldon when he's with Amy. She also starts to become ier through the guys. She makes inadvertent references to Star Trek, and, thanks to Sheldon, becomes addicted to Age of Conan. She also dates Stuart, who runs the comic book store. However, when Penny and Stuart are making out, she accidentally calls him Leonard, and as a result, they stop seeing each other.

When she learns that the guys are going on an, she is visibly upset, buys Leonard a farewell gift, and tells herself, after speaking with him, that she es he wasn't going.

In season three, when the boys get back from the expedition, Penny es Leonard the second she sees him. However, Leonard and Penny's relationship has a rocky start because they have some trouble getting used to being more than friends, but they eventually start a relatively stable relationship.

Family


Penny's sister is mentioned as having her  while both she and her husband were drunk. It is known that she has a nephew who turned 13 in season two, likely the son of Penny's sister. When Christy (Penny's friend from Omaha, Nebraska) comes into town, Penny reveals that she has a brother and at least one male cousin, as she claims that Christy slept with the former while being engaged to the latter.

Her brother also works in a, though it's not clear if it is the same brother Christy slept with. This is first hinted at in "The Pirate Solution" as Penny describes him as 'kind of a ' and tells Leonard that he would like him. It is finally confirmed in "The Rhinitis Revelation" when she asks to make her brother stop cooking meth, but without involving the. In season 7 in "The Hesitation Ramification", Penny mentions that her Dad gathered all the relatives together to see her scene on NCIS, which included getting her brother a day out of rehab. They also bought a large sandwich to share. When her scene is cut, Penny mentions that the sandwich and her brother are gone and as far as she knows her brother's on the way to Mexico.

Sheldon implies Penny's mother is and in "The Flaming Spittoon Acquisition" says that her mother must have  when she was  with her.

In season two, "The Maternal Capacitance", as Penny is explaining in the final scene that her father stopped playing catch with her, she quotes her mom talking to her dad, and suggests his name is Bob, though it is later revealed in "The Boyfriend Complexity" her dad's name is Wyatt.

Members

 * Father: Wyatt
 * Mother: Unnamed
 * Brother: Unnamed
 * Sister: Unnamed
 * Nephew: Unnamed
 * Cousin: Unnamed

Work Experience
Penny is described by others and considers herself a waitress/actress though she has told Leonard that she is a "" actress despite her short acting. Her income/living is derived from working at the Pasadena Cheesecake Factory as a waitress and living off the guys in Apartment 4A. In The Occupation Recalibration (S7E13) she quits the job as a waitress and declares she would engage herself in acting area fulltime. Leonard has never discouraged Penny when she joins them for meals, s on their  connection and paying for her  s.

As of S7E13, Her acting career credits consists of


 * A role in a low budget  "Serial Apist". This happened before she moves into Apartment 4B (in the Pilot), but is not revealed to the audience until The Hofstadter Insufficiency (S7E01).
 * A one night showcase production of the  (The Loobenfeld Decay, S1E10).
 * A production of, performed over a ; (The Terminator Decoupling, S2E17; later mentioned in The Psychic Vortex, S3E12 and The Recombination Hypothesis, S5E13).
 * A commercial (The Skank Reflex Analysis, S5E01; later mentioned in The Recombination Hypothesis, S5E13; in The Transporter Malfunction, S5E20, she says she gets a residual check from her commercial, which presumably still refers to this one).
 * Acting class production of (The Monster Isolation, S6E17).
 * A bit part in NCIS that was cut from the final show (The Hesitation Ramification, S7E12).

Leonard
Leonard's and Penny's relationship is one of the primary topics of the series. Leonard became attracted to Penny the moment he met her and it didn't take her long to figure out that he had feelings for her. Penny shows no signs of interest in Leonard until "The Hamburger Postulate", when she hears of his failed attempt at a relationship with Leslie Winkle, though the sign is seen only by the audience. Despite these signs, she continues to date other men as Leonard continued to try and make her give him a chance.

She and Leonard went on a date in the finale of the first season, but they broke up not long after because Penny feared he would get bored with her due to his high intelligence compared to her own. They remain friends although signs of their feelings for each other continue to show. After Leonard returns from his three-month research trip at the, Penny immediately kisses him, having missed him greatly. Leonard welcomes her advances.



They begin dating again and despite another rocky start, they are together for most of Season 3. They break up again after Leonard says he loves her and she doesn't say it back. They again stay friends throughout season 4 but it is strained as Penny struggles to control her feelings for Leonard as well as her jealousy towards Priya. While, she admits to Raj that she shouldn't have ever broken up with Leonard. She even explains this to Sheldon without mentioning Leonard and Sheldon thinks that she has a thing for him.

At the spur of the moment in "The Recombination Hypothesis", Leonard asks Penny out on a date after he imagined what getting back with her might be like. Their real date ends successfully and they agree to take their relationship slow in "The Beta Test Initiation".

In "The Launch Acceleration", Penny suggested that they move up their relationship and get intimate, however, Leonard ruins the mood when he asks her to during their sexual activities. They later meet and Penny, unlike their first break-up, managed to reject his proposal and still stay in a relationship with him. During "The Countdown Reflection", there was some friction between the two of them about the proposal, but when Howard was being launched they were holding hands to comfort each other.

In "The Date Night Variable", Raj, who was butting into their date, insisted that Penny tell Leonard that she loves him, but she was not ready and threw him out of the apartment. Penny expressed doubts about her feelings for Leonard, though she claimed to be happy with the relationship in "The Decoupling Fluctuation". She almost told Leonard about her doubts and then ended up sleeping with him after looking into his sad eyes. In "The Holographic Excitation", Penny revs up their relationship by becoming more acquainted with his work and seducing him in his, after Amy and Bernadette confront her over her somewhat one-sided view of how her relationship works - that Leonard's job is to make her happy, and her job is to let him make her happy.

In "The 43 Peculiarity", Penny is working with a fellow student named Cole on an oral class project. Leonard is jealous so he follows him down the apartment stairs and tells him to watch out for "Penny's boyfriend" since he is a gang member. Penny is upset with Leonard and the two later meet in the hallway and have an argument. Penny tells him that she cannot believe that he does not trust her and that he embarrassed her in front of Cole who knew who he was since his picture is on her refrigerator. Penny continues to tell him that he is the one she is with and accidentally mentions that he knows that she loves him. Leonard is stunned and tells her that that is the first time she ever said that she loves him. He then interprets her stunned reaction and asks if they aren't going to make a big deal about this. She agrees and runs off to cry.

In "The Egg Salad Equivalency", after Alex asks Leonard out to dinner and didn't tell Penny about it, she begins to feel really insecure about their relationship. Leonard apologizes by showing up at her door playing an apologetic song on his cello. She decides instead of feeling bad, she will do something about it. First, she looks into science classes at college, but they sound boring. Then she buys some geek glasses to look smart, which does affect Leonard as he pulls her into his bedroom.



In "The Bakersfield Expedition" she develops an interest in comic books and Thor's hammer.

In "The Spoiler Alert Segmentation" Leonard suggests that he move in with Penny after he again gets exasperated with Sheldon. He asks her if she's all right with it, but she only agrees not to hurt his feelings and even tells Sheldon. When Amy confronts Penny since she can't move in with Sheldon, Leonard over hears. Penny tells him that he never asked her if she was ready and Leonard ends up back in apartment 4A.

In "The Tangible Affection Proof", Leonard takes Penny out to dinner for Valentine's Day. Penny feels that all the effort never meets the expectations. Penny sees an old boyfriend proposing to the girl that broke them up. Leonard again tries to propose and Penny stops him. That night Leonard tells Penny that she made a mess of the whole evening. Penny finally admits that she has commitment issues and the obvious path of their relationship ending in marriage scares her. Leonard then puts the responsibility of proposing on her and she should do it when she's ready. In the end, she does ask him to be her valentine.

In "The Closure Alternative" Penny was concerned about the passion Leonard showed for science, comics and various television shows while she had no passion in her life. Her dreams had always been to become a famous movie star and live a glamorous life. Anything less than that she felt was settling. Her epiphany comes that she is passionate about her boyfriend Leonard and all her wonderful friends.

In "The Bon Voyage Reaction", Leonard takes a job working on a Stephen Hawking expedition in the North Sea for four months over the summer. Penny will miss him, but knows that it is a good opportunity and sends him off. At the airport, she is fussing over him like his wife sending him off on a business trip. She also has to watch Sheldon over the summer, too.

In "The Hofstadter Insufficiency" Leonard hurts Penny because he seems to be having such a great time on the ship; she thinks that he is not even missing her. In "The Deception Verification", Leonard makes up for it by showing up early and hides in her apartment so that they can spend time together a couple before telling the gang that he's back. It works until Amy and Sheldon find them together after they think that Penny is cheating on Leonard.

In "The Raiders Minimization", Penny purchases a psychology book that Beverly Hofstadter has written about all his problems growing up. Leonard is extremely embarrassed, so Penny does whatever he wants to make him feel better, including having sex in his lab. He mentions this to Howard, so Bernadette tells Penny. She dresses up for sex to tempt him, and then for revenge makes him Skype with his mother to discuss him using his mother's past with him to manipulate elements of his sex life.

Sheldon
Penny and Sheldon constantly argue with each other. Sheldon is quick to take shots at Penny's, job, and failing career (though he generally doesn't understand that these statements are hurtful) while Penny throws off his personal routines, such as during "The Panty Piñata Polarization" when Penny messes up Sheldon's laundry night. But despite their differences, Sheldon and Penny are very close, and are quick to help each other. They have taken care of each other on multiple occasions; often times doing things they really don't want to do to make each other feel better. Penny has stated that they are friends.

Major examples are when Penny takes care of Sheldon when he is sick and when she lets him stay at her apartment when he gets locked out, even letting him sleep in her own bed. Sheldon was also quick to come to Penny's aid when she called for help after falling in the shower and dislocating her shoulder, going so far as to drive her to the hospital, despite not knowing how to drive.

Many of these occurrences end with Penny singing Soft Kitty to Sheldon to make him feel better; Sheldon sang it to her on one occasion as well. One of the biggest examples of their friendship is that despite his own rule of avoiding physical contact with people, Penny was the first person Sheldon hugged on the show. And remains one

of only three people he's hugged who aren't members of his family, the only others being Wil Wheaton and Amy Farrah Fowler. To date, Sheldon and Penny have hugged two times: once in "The Bath Item Gift Hypothesis" and again in "the Large Hadron Collision". Sheldon also is in the habit of insulting Penny when he asks her for a favor.

In "The Werewolf Transformation", Penny convinces him to let her cut his hair since his barber is in a coma. She listed times she's taken care of him, saying that she's taken him to Disneyland, kicked a bully in the nuts for him, sings him Soft Kitty when he's sick, and that he's even seen her naked once. Sheldon eventually agrees to let Penny cut his hair.

In The Closure Alternative " Penny decides that she is passionate about her friends and tells Sheldon that she is glad he is in her life.

In "The Bon Voyage Reaction", Leonard asked Penny to keep an eye on Sheldon while he's gone. They hung out together and Penny took him shopping, developing a brother/sister relationship. In "The Hofstadter Insufficiency", they didn't even get on each other's nerves, and Penny played the games that Sheldon wanted to play or usually played with Leonard. Sheldon even tried to comfort a lonely Penny and let her hug him with very little objections. After Sheldon had a nightmare, he knocked on Penny's door early in the morning. He woke Penny up and all she did was ask what he wanted, She was neither mad or disgusted by his intrusion, indicating a good, stable, friendly relationship.

In "The Romance Resonance" Howard makes a romantic gesture to Bernadette by writing her a song. Leonard mentions that Penny never does anything like that, except for sex which doesn't count. Penny is determined to romance Leonard. Raj can only suggest that she cook for him or reenact a scene from a romantic movie. Finally after a candlelight dinner, Penny puts on some romantic music, spreads rose petals into her neatly cleaned bedroom and presents Leonard with a first edition of his favorite book from when he was growing up,. Unfortunately, Leonard had already purchased the book after they had seen it in a used together. Penny gets upset telling him about all the thoughtful things he had done for her and shows him her collection. An, a rose given to her "just because" and the eleven page letter he wrote her after the first time they slept together. Leonard was very touched that she kept all these things. He then kisses her, showing that Penny did do something romantic.

In "The Thanksgiving Decoupling", Penny reminisces about a Thanksgiving she had in Las Vegas with former boyfriend Zack Johnson which included one of those silly fake weddings. Penny appears devastated when her friends inform her that the wedding was real and she is married. Penny and Leonard argue about how quickly she should get her annulment so Penny invites Zack over to their Thanksgiving dinner at Howard's mother. Zack appears as  dimwitted as ever telling them that breaking up can be hard on the kids which they don't have. Finally, Penny and Leonard make up and she tells him that the next time she gets married it will be for real, for life and (jokingly) or for money.

In "The Cooper Extraction" Amy points out to the gang that most of them would not know each other if Sheldon had not been part of their lives. Penny feels that Leonard would never have successfully asked her out at the Cheesecake Factory, while Leonard suggests that she would have ended up with Zack. In the Zack story, he spent all the rent money on some magic beans. Amy thinks that if Amy and Leonard were out of the picture, the lusty Penny would try and seduce her neighbor Sheldon much to Penny's disgust and the guys' amusement.

Howard
Upon meeting, Howard constantly hit on Penny in ways that made her deem him "disgusting". One point she calls Howard "pathetic and creepy" which breaks his spirit for one episode. Leonard makes Penny go and apologize, however she ends up breaking Howard's nose when he tries to kiss her. Their dynamic remains the same for the most part throughout the series, but begins to change when Howard begins to date her friend Bernadette. Although Penny is not a fan of him, she and Howard maintain a friendship, although they rarely hang out outside the group. Howard flirts with Penny much less and becomes more casual towards her after he begins his relationship with Bernadette, which Penny obviously enjoys, although she still pokes fun at him.

Raj
Like with all other women except his mother and sister (and thus one would assume all female relatives), Raj is unable to speak to Penny unless he is drunk or on medication. They hang out within the group a lot and Penny occasionally attempts to tease him into talking to her. After she goes to a People magazine reception with him, he introduces her to his parents as his girlfriend, though they want him to find an Indian girl. Raj begins to like Penny as the series goes on and the two end up getting drunk and appear to have slept together.

Later Raj tells Penny that they did not have sex, and in clarification, he tells her that nothing physical happened between them as she straightaway asked if he had protection and then he had trouble putting it on and she tried to help so he ejaculated prematurely. Raj asks Penny not to tell anyone and Penny promises to keep silent. Raj attempts to actually date her but she tells him she just wants to be friends. Despite their rough past, Penny attempts to find a girlfriend for Raj and comforts him when he needs it. She also invites him along to their girls' night out while the guys play their Dungeons and Dragons Christmas game. He discovered he had come over his Selective Mutism when he was able to discuss his break-up, with Penny without being drunk in The Bon Voyage Reaction.

Bernadette
Penny and Bernadette worked together at The Cheesecake Factory until Bernadette received her PhD and became a microbiologist, and are close friends. Penny introduced her to Howard on a blind date. She is the first person outside of the few boyfriends that Penny is seen to hang out with on a regular basis. They enjoy hanging out at Penny's apartment, comforting each other, and going out together.

They also hang out with the guys together once Howard starts dating Bernadette. In "The Countdown Reflection", because Bernadette wants to get married to Howard before he goes into space, Penny, along with Amy, Sheldon, Leonard and Raj get ordained as ministers to so they can officiate at the wedding ceremony.

Penny is notably upset when she is in the middle of Bernadette and Amy's fight during "The Parking Spot Escalation". She is really hurt once Amy takes a swing at Bernadette with her purse hitting Penny in the face and breaking her nose.

Amy
When Bernadette and Penny were having a girl's night, Amy injected herself into Penny's life by getting herself invited. In no time she claims that she and Penny are best friends and calls her "bestie". When she initially hangs out with Penny and Bernadette her lack of social skills make it somewhat awkward, but as she spends more time with them they bond and the three become their own group as a counterpart to the group of guys.

The two gradually form a tight friendship and continue to spend more time together and are quick to aid one another whenever the other needs it. Amy is aware that Penny is the planet that her social life revolves around and quickly reverses her course if she is mad at her or is annoying her. Amy gave Penny a large ugly painting of the two of them to celebrate their friendship. At one point she realizes that Penny hates it, Penny rushes over to Amy's apartment to rescue their friendship and re-hangs the painting in her apartment on the fourth wall (facing the audience).

In "The Shiny Trinket Maneuver", when Amy had her argument with Sheldon, Penny took Sheldon to the jewelry store to buy a gift. Sheldon ends up getting Amy a tiara. Penny is more than happy putting the tiara on Amy, which makes Amy ecstatic. In "The Weekend Vortex", Amy confides in Penny when she had an awful time at her aunt's birthday party because Sheldon backed out on his promise to attend an MMORPG marathon. Penny gets them to play quarters where the loser will need to drink beer. Amy turns out to be very good at the game from all the time she spent as a child throwing coins wishing for friends, and as a result, Penny gets drunk. She convinces Amy to make a scene and the two barge into the guys' apartment as they are in the middle of their marathon. Amy fails to keep up her ruse of leaving Sheldon for a make-believe character named Arman, and Penny comes to her rescue by telling Sheldon the truth. Penny is also very upset to be in the middle of the argument between Amy and Bernadette over



Howard's parking space in "The Parking Lot Escalation", especially after Amy accidentally hit her in the face with her change-filled purse, giving Penny two black eyes and a broken nose.

In "The Cooper/Kripke Inversion" Penny asks Sheldon if he is ever going to sleep with Amy. After Sheldon says that it is a possibility, Penny gets very excited for her friend. In "The Love Spell Potential", Penny tells Sheldon's and Amy's "D&D" characters to "do it" (have sex/coitus) in the game, which upsets Amy and causes her to leave. In "The Spoiler Alert Segmentation" Penny ruins Amy's chance to move in with Sheldon because she is ready for Leonard to move in with Penny. Sheldon also didn't want Amy moving in either. To prove that she could do it, Amy tells everybody that she should move in with Penny which Penny also disapproves of.

Priya
Priya was jealous of Penny because of Leonard's previous relationship with her, and eventually asked him to stop communicating with Penny. Though Penny did so, she became angry towards Priya for dating Leonard, as she had only recently realized she still had feelings for him. The friendship is restored when Priya becomes friendly with Penny in the engagement reaction episode where they strike up a friendly conversation and bond in the process, although Penny remains silently jealous. When Priya's relationship with Leonard ended after admitting that she slept with her ex-boyfriend a few weeks ago, Penny and Leonard start dating again.

Quotes
"Hi (Hi, Hi) (Hi, Hi)...Hi?" [Meeting Sheldon and Leonard for the first time]

"Amy's right...I do want to fling my poo at her." [To herself after seeing Priya]

"Sheldon, you forgot something...this plasma grenade. (explosion) Look, it's raining you!¨ [Teasing Sheldon after beating him in Halo]

"Okay, sweetie...I know you think you're explaining yourself, but you're really not." [To Sheldon when she can't understand Sheldon]

"Who's Radiohead?" [Challenging Sheldon at his knowledge]

"Not since I found out that the teddy bear you gave me had a webcam in it." [To Howard when he tricks her at the door]

"When I go, I usually just get hammered and ride the cable cars" [Talking about San Francisco]

"Come on, Sheldon, you can't leave. Don't you need to stay here so the mother-ship can find you when it returns?" [To Sheldon when he tries to relocate.]

"Okay, Leonard, I know I said I could handle your roommate but I was wrong, we're going to have to break up." [To Leonard when Sheldon wakes them up at night]

"Just move your scooter before I pick it up and throw it in the dumpster!" [To Howard after he makes a dirty joke to her]

"Soft Kitty, Warm Kitty. Little ball of fur. Happy Kitty, Sleepy Kitty Purrr, Purrr, Purrr" [To Sheldon whenever he's sick]

"She agreed to go out with for free, what more do you want?" [To Howard about Bernadette]

"Sheldon tried to take the ring and I punched him" [After giving Sheldon a whopper in the nose]

"Are you high?" [To Howard about Bernadette]

"Bark if you want me to call PETA" [to Cinnamon]

"They're gonna get beat up at Walgreen's" [About Howard and Raj going goth]

"Do or do not, there is no try." [Quoting Yoda after sex]

"It's just rum. It stopped being eggnog about a half hour ago" [To Leonard at Christmas]

"Actually, that's not true, Leonard. Recently I've been thinking that given the parameters of your experiment, the transport of electrons through the aperture of the Nano fabric metal rings is qualitatively no different from the experiment already conducted in the Netherlands...observed phase shift in the diffusing electrons inside the metal ring already conclusively demonstrated the electron analog of the Aharonov-Bohm quantive ference effect...That's it, that's all I know. Oh wait! Fig newton's were named after a small town in Massachusetts not the scientist!" [Penny unknowingly insulting Leonard's work]

"Yeah, you can't sit there... oh no, you see in the winter it's close enough to the radiator so that he's warm but not so close that he sweats. In the summer, it's directly in the path of a cross breeze created by open windows there and there. it faces the television at an angle where it isn't direct so he can still talk to everybody but not so wide that the picture looks distorted." [Explaining to Bernadette why she can't sit in Sheldon's spot]

"What's up, buttercup?

What's the word, hummingbird?

What's the gist, Physicist?" [Greeting Sheldon at the door]

"Leonard, look. Sheldon's hugging me!" [To Leonard as she and Sheldon embrace]

"Hey, guys, watcha doing? Going out to discover electricity?" [To the guys with their kites]

"Who do we love?!" [As Sheldon knocks on her door]

"I got my geek on boys!" [To the guys]

"Out of coffee, need coffee" [Coming over for coffee]

"I smell Chinese food" [Using smell to find food]

"What up, Moonpie?" [Teasing Sheldon]

"Leonard...will you be my Valentine?" [After she agrees that she will propose to Leonard]

"Your mom still here?... Come on in" [To Leonard when asking for alcohol]

"Mrs. Cooper, Hey, it's Penny. Yeah, I think I broke your son." [To Mrs. Cooper after she gets Sheldon]

"Hey, guys, my friends and I got tired of dancing so we came over to have sex with you." [To the guys while they play Halo]

" We're keeping things...you know... homeostasis" [After failing to break up with Leonard]

"Don't worry, sweetie, no one has." [To Sheldon about playing Dungeons and Dragons with girls]

"Oh, this isn't alcohol, this is a magic potion that makes me like you." [To Sheldon about playing D&D]

"I drink my potion." [To everyone as they prepare to battle imaginary ogres]

"Shut up, can you do that?!" [To Professor Proton about the potato clock]

"I'm happy Leonard's found someone... not that anyone asked" [To the guys about Leonard dating Priya]

"Awww, he's got the same look my little nephew gets when he can't figure out how I got his nose." [Teasing Sheldon about why he can't figure out the magic trick]

"No, but I can name all the Kardashians." [To Amy when she doesn't understand her]

"Sweetie, I understand you have scars that non-professional can heal" [to Sheldon]

Trivia

 * Penny was 22 years old at the beginning of the show (in the early fall of 2008, when "The Barbarian Sublimation" aired), which means she is the youngest of the gang. Penny is a, meaning she was born between November 22 and December 21. In "The Prestidigitation Approximation", Howard does a fake magic card trick in which the sum of the digits of one's birth date, excluding the year, are used to get the number of the card to be selected. Penny turns over the fifth card, making her birthday in the span of the Sagittarius one of four possibilities: November 30th, December 2nd, December 11th, or December 20th. If Penny's birthday is November 30th (1+1+3+0=5), it would match the birthday of Kaley Cuoco (Saturday, November 30, 1985) exactly. The only possible birth date of Penny would be Monday, December 2, 1985 if one alternatively interprets the rules of Howard's card trick as requiring one to turn over the card corresponding to the sum of the digits of the month and adding the day. Though David Underhill refers to Penny as a "gorgeous 22-year-old" in "The Bath Item Gift Hypothesis" (airdate December 15, 2008), he could have simply estimated her age, as it certainly appears to be close to Christmas and the episodic events probably span days rather than weeks (if one were to ignore the hypothesis that the airdate is reality in the show). In real life, the 28-year-old Cuoco is the youngest of the group, and approximately 13 years younger than Jim Parsons, who is the oldest of the group.
 * In "The Robotic Manipulation", Sheldon calculates that Penny dated an estimate of 193 (±8) men and had sex with approximately 31 of them.
 * Penny grew up on a farm and rebuilt an entire engine all by herself when she was 12.
 * Penny was a junior champion.
 * The previous occupant of Penny's apartment was a 200-pound transvestite named Louie/Louise with a skin condition, who worked as a police officer, according to Sheldon. He is seen during a flashback in "The Staircase Implementation", where he refers to Sheldon as 'crazy'.
 * Penny is the only member of the main set of characters whose last name has not been spoken or revealed, but Bill Prady has said it eventually will be.
 * Penny claims to be a, but will eat fish and the occasional steak.
 * Penny often smells like either (because she wears vanilla oil) or  (because she works at The Cheesecake Factory). Sheldon has also stated in "The Decoupling Fluctuation" that she uses green, apple-scented, insisting that she switch back to that from coconut.
 * Penny's acquaintance Christy could be a reference to Kaley Cuoco's time on . Penny was also the name of the witches' grandmother.  The reference may also apply to Penny's father's name, Wyatt.
 * Penny eats with a fork and double-dips her egg rolls (unappealing attributes, according to Sheldon).
 * In "The Staircase Implementation", it is revealed that Penny was almost a teenage mother.
 * Penny is very kind and shows great toward others, but can become extremely fierce when provoked. She has yelled at Sheldon, Raj, and Howard when they annoy her too much, and Leonard when she's angry.
 * When under, Penny exhibits some of Sheldon's behaviors.
 * Penny has an amazing sense of smell.
 * Penny believes in s, s,, , and other 'superstitions', but not.
 * Penny went to, but dropped out for unspecified reasons. She goes back near the beginning of the sixth season, taking one history course. By the middle of the season, she is also taking an acting class, and at the beginning of season 7, she is taking a psychology class as well.
 * A running gag of the show involves Sheldon knocking on Penny's door and saying her name after every three knocks. He repeats this thrice or until she answers the door.
 * Penny often resorts to . When Sheldon's mom pointed out her disapproval of a top (shirt) belonging to Penny, she said that she had received free drinks by wearing that top. It is also known that, while she was dating Leonard, she never paid for her movie tickets. She also gets free meals from hanging with the guys since her portions were always paid by Leonard; she said they were loans but she knew Leonard would not ask her to pay it back. She also gets free internet by using Sheldon and Leonard's -- leading Sheldon to regularly change the password to ones which accuse her of freeloading.
 * She turned down Sheldon's offer for a date (although Sheldon only asked her to make Amy jealous) as Penny was the only other woman that Sheldon knew well.
 * Penny was a in high school, making fun of a girl with a  and taping another girl up and leaving her out in a  until the next morning.
 * Penny is remarkably adept at games in general, excelling at Halo, Age of Conan, and most recently chess, checkmating Leonard on her first try (though the latter may have been because, as Sheldon has pointed out, Leonard is terrible at chess).
 * Penny owns a red 1980s  convertible car. Featured in several episodes, the car appears to be in a bad condition, which is not helped by Penny, who pays no heed to the . While sitting in her car, Sheldon will continuously remind her that the 'check engine' warning light is on, an action that irritates Penny tremendously. Penny is a very bad driver: in "The Guitarist Amplification", a point of argument between Penny and Leonard is when Penny finds out that Leonard complains about her driving behind her back. Later in the episode, she runs a without even noticing it, and then, when Leonard mentions it, she looks back to find it, and Leonard, panicking, shouts "EYES ON THE ROAD, EYES ON THE ROAD!"
 * When Penny is shocked she several times while considering a reaction.
 * Over the course of the series, Penny has exhibited traits of . She is often seen drinking wine or other harder beverages while in her apartment, both alone and in the presence of her friends. She often seems to use wine as a means to deal with her issues. She will many times use this method on her friends as well to help them deal with their problems, most notably when she realized alcoholic drinks are able to help Raj overcome his selective mutism, or to help Sheldon overcome his stage fright.
 * Often says "OMG" or "Oh My God" when shocked, to the annoyance of Sheldon.
 * In "The Closet Reconfiguration", while cleaning Penny's closet, Sheldon finds a thing that "appears to be a battery operated chew toy" which is possibly a vibrator.
 * Despite Amy's admiration for Penny, she does realize her limitations in her intelligence and her acting career.
 * In "The Scavenger Vortex" no one wanted Penny on their team because she was a "liability".
 * Penny thinks that the wedding chapels in Las Vegas perform fake weddings.
 * Penny was unknowingly married to Zach Johnson.
 * In "The Adhesive Duck Deficiency" when Sheldon was dressing her, due to her dislocated shoulder, he had to put her hurt arm into the sleeve. He grabbed what he thought was her arm, but was actually her breast.
 * Penny once starred in "The Diary of Anne Frank" over a bowling hall; this is actually a plot point from episode "The Story of Anne Frank and Skeevy" from "Eight Simple Rules" where Kaley Cuoco played Bridget Hennessey, the eldest daughter.
 * A major mystery of TBBT was Penny's last name and for a while it was Mrs. Penny Johnson, whether she realized it or not.

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