Sheldon Cooper

Sheldon Lee Cooper is a theoretical physicist from Caltech who rooms with Leonard in apartment 4A of their apartment building with a broken, rundown elevator in which it always seems to be out of order, due to both of them causing an explosion in it. He is Leonard's best friend and colleague, who appears to have obsessive–compulsive personality disorder, beginning with suspicion, of it in episode S01E02 (The Big Bran Hypothesis). A prodigy, Sheldon possesses a Master's degree and 2 PhD's. Recently, he has switched disciplines from bosonic string theory to heterotic string theory and has reconciled the black hole information paradox using a string network condensate approach. Like Leonard, he keeps a whiteboard, in the living room for scientific theories, especially for his work on string theory. Unlike Leonard, he embraces his genius fully and doesn't mind sharing details of his life that Leonard finds embarrassing, such as, their main, weekend activity being Klingon Boggle tournaments until 1AM. It's indicated that Sheldon's genius is concentrated more fully on science (though, he does have an extensive general knowledge as well, shown by his comments regarding the introduction of the fork into Thailand ,and his knowledge of history) and that his 187 IQ is higher than Leonard's; he tends to question Leonard's theories and has a larger background full of behavior common to child prodigies. Sheldon is often considered to be the main protagonist of the series.

Biography
Sheldon was born in Galveston, Texas to Mary and George Cooper, devout Christians. When he was a child, at age 12, he conducted experiments involving the height of stairs and deduced that if a step on a staircase is 2 millimeters off or more, a person is likely to trip (this resulted in his father breaking his clavicle). At the same age, he dabbled in lasers and this resulted in him being sent to boarding school (most likely a boarding school for the specially gifted or he went and actually taught at the boarding school); it is heavily implied in a CBS promotional clip that the government took Sheldon's laser away and hushed the college professor who witnessed the experiment. According to his mother, when Sheldon was 13, he attempted to build a nuclear reactor at a young age in order to provide free electricity for his town; that failed after a government agent informed him that, it was illegal to store yellowcake uranium in a shed, he then had a big tantrum at this. She also reminded him of how the neighbour kids used to beat him up, due to him boasting to them he was smarter than them. He also built a so-called "Death Ray" (which was unsuccessful) and a robotic arm made from substrates cooked in his sister's Easy-Bake Oven. Sheldon left school in the fifth grade and went to college, where he received his first doctorate at the age of 16. He then spent four years on his second dissertation, and at the beginning of the series had held his current job for three-and-a-half years.

Personality
Sheldon also has common qualities associated with being a prodigy, such as an inflated ego, social ineptness, and an inability to identify emotionally with others. He fails to understand not only the simplest sarcastic jokes made by Leonard, but also regards Penny's sadness over her break up with blatant disgust. That isn't to say Sheldon doesn't have a conscience; he's simply more likely to do what's scientifically ethical (not donate to a "high IQ sperm bank" because his sperm won't guarantee high IQ offspring) rather than morally and socially ethical (break into Penny's home to organize her things). Sheldon also remains unswayed by Penny's beauty (although he was quoted by saying "no one can be that attractive and this skilled in video games"). He also has symptoms of possible obsessive compulsive personality disorder and Asperger syndrome; or any type of Autism Spectrum Disorder. E.G., when he finds Penny's apartment messy, he sneaks in during the night and cleans it up because he can't stand being in the same hallway with something so disastrous. Also, he refuses to sit anywhere other than his designated spot on the couch. He is calculating and cynical, believing that Leonard is only setting himself up for disappointment as he continues to crush on Penny.

Quotes
WHEATON!

-Sheldon on various occasions

Relationships
Of all main characters of the show, Sheldon has displayed the least interest in pursuing a sexual relationship. He has, however, had a few opportunities, although he never seemed to realize it.

Leonard Hofstadter
Sheldon is best friends with Leonard, as they live together and are accustomed to tolerating each other ever since Sheldon put out an ad for a roommate with a list of criteria to follow. Despite Sheldon sometimes making remarks to the contrary, he appreciates Leonard and assures Leonard that his friend will not die alone.

Rajesh Koothrappali
Sheldon and Raj's relationship is rather complicated. Sheldon once offered help to Koothrappali by giving him a job under his supervision, with Raj reluctantly accepted to save him from getting deported back to India. Raj is easily annoyed with much of Sheldon's antics, but has grown accustomed to them. Raj, as much as he hates Sheldon's opinions on every certain situation and his behaviour, considers Sheldon as a good friend.

Howard Wolowitz
Sheldon and Howard's relationship is purely existent, albeit extremely complicated. Sheldon often makes fun of Howard for not having a Doctorate. In "The Apology Insufficiency", Sheldon angers Howard by revealing details to the FBI that prevent him from obtaining a much needed security clearance. Howard refuses to accept Sheldon's apology, until Sheldon gives Howard his spot on the couch, prompting Howard to forgive Sheldon. Howard, much like Raj and Leonard are quite unused to his inflated ego. On the other hand, he and Sheldon are shown to get along well - He tried to help Sheldon drive on a simulator he created, and did help with Howard's creations. Nevertheless, the relationship between the two have it's ups and downs.

Lalita Gupta
Lalita was arranged to be married to Raj. They went on a date together which gradually deteriorated as alcohol made him obnoxious. When Sheldon arrived at the bar, he thought she looked similar to an Indian fairytale princess from a bedtime story his mother used to read to him when he was sick. When he told her, she was flattered and ended up dumping Raj and going out for dinner with Sheldon. When he was asked about it the next day, he simply said that they ate and discussed dental hygiene. He didn't seem to realize that he technically was on a date with her.

Ramona Nowitski
Ramona was a huge admirer of Sheldon and had an obvious crush on him, which he didn't seem to notice. In The Cooper-Nowitski Theorem, she asked him out for dinner at his apartment. After that, she began spending more and more time with him, preventing him from doing anything recreational like playing Halo, paintball or watching Battlestar Galactica so he could focus on his work. Eventually, he made a breakthrough. When she suggested they share credit, he simply responded "Get out", after which she angrily left.

Martha
When Raj brought Sheldon to a faculty mixer to act as wingman, they picked up a girl named Abby and her friend, Martha, brought them to Sheldon and Leonard's apartment and played Rock Band with them. While Abby and Raj hit it off, Martha became interested in Sheldon. The two enjoyed a few stimulating discussions together at their second meeting, during which Raj and Abby "[got] busy", Martha visited Sheldon's room in the middle of the night and asked to come in, hoping for sex. Misinterpreting this, Sheldon went to sleep in Leonard's room and left Martha alone in his. She apparently lost interest in him after that.

Amy Farrah Fowler
Sheldon first met Amy via a dating site where Howard and Raj sneakily set up an account for him in the season 3 final, "The Lunar Excitation". Eventually, they found a perfect match for him and agreed to met her at a cafe. When they told Sheldon, he refused to do it, believing dating sites to be "hokum". However, he was blackmailed into doing it when Raj said he had hidden a dirty sock in Sheldon's room and wouldn't remove it unless Sheldon went on the date. When they arrived, Sheldon had doubts until he met Amy, who acted exactly like Sheldon. She only agreed to come on the date as she and her mother have an agreement that Amy would date at least once a year. Sheldon noticed they had a lot in common and brought her a beverage of Tepid water. Raj and Howard regretted what they had did, with Howard saying, "Good God, what have we done?". In the season 4 premier, "The Robotic Manipulation", Sheldon reveals that he has been talking to Amy for a few months online, after they first met. Penny is amazed that Sheldon has a girlfriend and Howard and Raj call Sheldon and Amy, "Shamy". But Sheldon denies that Amy is his girlfriend and mainly talk about Sheldon's theoretical physics, Amy's Neurobiology and the possibility of having a child together via vitro fertilization. Penny convinces Sheldon to go on a proper date with Amy first, before he actually decides to have a child. Penny eventually ends up on the date with them, as she had to drive them to the restaurant. Whilst there, Penny tries to make conversation, but fails, while Amy and Sheldon calculate the number of men Penny would have dated. He ends up with 193, with 31 sexual encounters. Amy then asks if Penny feels like a "slut" and reveals that she has had 128 sexual encounters. Eventually, Penny convinces Sheldon to not have a child with Amy after threatening to tell his mother. In episode 3 of season 4, Amy and Sheldon break up for a period of time after an argument over their fields and which one is better than the other. This results in Sheldon buying a clouder of cats, which worries Leonard. So he calls Sheldon's mother, who is unusually surprised at what she sees with Sheldon. She then calls Amy and then does a technique of reverse psychology which Leonard instantly picks up on, but Sheldon is completely oblivious to. She tells Sheldon that it was a good thing he and Amy broke up because they are completely incompatible. Sheldon is instantly offended, so to prove his mother wrong, he offers Amy to reconcile, which she agrees after a negotiation on the amount of responsibility Sheldon has to accept for the break up (Amy offered 80%, Sheldon countered with 40%, settling at 65%). Afterwards, Sheldon and Amy give away $20 to anybody willing to adopt a cat. In episode 5 of season 4, Amy requests Sheldon to meet her mother, which terrifies him and tries many ways to avoid her, as he thinks it's another step in their relationship. However, Amy says it is for her mother and not for her, as she only wants to be just friends with Sheldon and wants to pretend to be Boyfriend/Girlfriend to please her mother. Sheldon freaks out Amy's mother a bit, which was want Amy wanted her to be, when they tell her about their "fake" sex life.

Recent Family History
Sheldon had an extremely difficult childhood. Twenty-nine years ago, Mary Cooper, a devout Christian living in Galveston, Texas, gave birth to her son Sheldon in a K-Mart. As her son grew, being a distinct child prodigy, his own scientific beliefs were often at contrast with her spirituality, though she held that his knowledge "comes from Jesus." Nevertheless, she was a good mother, and the only person ever able to control "Shelly." Sheldon's roommate, Leonard Hofstadter, called her Sheldon's "Kryptonite."

Sheldon also has a fraternal twin sister, Missy Cooper. Tall and attractive, she caught the attention of Leonard, as well as of Rajesh Koothrappali and Howard Wolowitz. Sheldon recognized that within Missy's eggs lay the potential for another "superior mutation" like himself, and on this grounds considered his friends unsuitable to be with his sister. Sheldon became offended when he found that Missy tells others he is a rocket scientist; he apparently thinks the title is inaccurate and below him, telling her she might as well say he is a toll collector at the Golden Gate Bridge.

Along with Missy, Sheldon also had an older brother, who often beat him up. Mary described the two of them as being "dumb as soup."

Sheldon's father, George, an almost-redneck Texan, died recently, and Missy visited Sheldon to bring paperwork regarding their father's estate. Sheldon recalls that his father would force him to watch football despite his lack of interest for the sport.

Sheldon is also very fond of his grandmother, whom he calls "Meemaw", who in turn calls him "Moon Pie".

Sheldon has a maternal uncle, Edward Cooper, who is called "Stumpy" as the result of a time when he cleaned a woodchipper by hand. Sheldon had an uncle, called Carl Cooper, who was killed by a badger whilst cleaning a chimney.

Sheldon's eating habits

 * Sheldon prefers his broccoli diced not shredded, brown rice instead of white, chicken diced instead of shredded with low sodium soy sauce and spicy hot mustard.
 * Sheldon loves to eat at Big Boy, an American restaurant chain.
 * Sheldon eats at the Cheesecake Factory on Tuesday nights (presumably before the occasional Klingon Boggle game), which replaces eating at Big Boy (which then moved to Thursday until they had pizza on that day. Sheldon most likely eats at Big Boy whenever, or on special occasions.)
 * Sheldon eats Giacomo's pizza on Thursday with with sausage, mushrooms, and light olives.
 * Sheldon sorts his cereal numerically by fiber content.
 * Sheldon neither drinks coffee, nor alcohol, because he promised his mother that he wouldn't start doing drugs while he resided in California. Instead he likes drinking diet coke. When forced to order a cocktail, Sheldon solves the problem by ordering a "virgin Cuba Libre", which is nothing more than a coke in a tall glass, served with a lime wedge. He then goes on to ask if Penny would make it diet.
 * Sheldon likes Chinese food, and is adamant that the number of dumplings can be evenly split between all partakers of the meal.
 * Sheldon eats Thai food on Mondays - Mee Krob with extra peanuts.
 * Sheldon thinks chocolate pudding is the best one.
 * Sheldon does not believe that three-tined forks are, in actuality, forks, but tridents, and refuses to eat with them.
 * Sheldon doesn't like to go to the cinema if he can't eat Red Vines or drink Icees during the movie.
 * Sheldon maintains that Icees and Slurpees are wholly different
 * Sheldon always eats oatmeal for breakfast on Mondays.
 * Sheldon always has French Toast for breakfast on some unspecified day of the week.
 * Sheldon rewards himself with "Honey Puffs" cereal.
 * Sheldon drinks herbal tea, sometimes with honey.
 * Sheldon only drinks hot chocolate on months ending with 'r', which he explains: "What's life without whimsy?"

Trivia

 * Sheldon is 29 years old.
 * Sheldon possesses several qualities that are associated with the Autism spectrum - He appears to show symptoms of Obsessive-Compulsive Hyperactivity Disorder, Stage Fright, Mysophobia (fear of germs and contamination), Hypochondriasis (anxiety of getting sick), and intolerance of others coming through whatever property Sheldon owns, etc.
 * Sheldon received a Stevenson award when he was 14.
 * Sheldon has an Alienware laptop.
 * Sheldon has an iPhone 4.
 * Sheldon hates it when people sit in "his spot"—the left hand side of the couch.
 * According to Mary Cooper (Sheldon's Mother), Sheldon has her eyes, but has his daddy's temper and all that science stuff comes from Jesus.
 * According to Sheldon, he says that his mom wants grandchildren from Sheldon.
 * Sheldon's favorite Linux-based Operating System is Ubuntu.
 * Sheldon was born in a K-Mart.
 * Sheldon wakes up at 6:15 every Saturday, pours himself a bowl of cereal, adds a 1/4 cup of skim milk, turns on BBC America and watches Doctor Who.
 * Sheldon was raised in a Christian houshold in Galveston, East Texas, Texas, USA (Texas just happens to be the same state that he was actually born in)
 * Sheldon has a Master's degree and two PhDs.
 * Sheldon went to college at the age of eleven, entered graduate studies at fourteen, and received his first PhD at sixteen.
 * According to Leonard, Sheldon is a Semi-Pro masturbator. This statement is in the first episode and has been replaced by the idea that Sheldon is asexual.
 * Sheldon was a visiting professor at Heidelberg University in Germany at fifteen.
 * Sheldon took four years to write his second Doctor of Philosophy thesis.
 * Sheldon has recently switched his research from bosonic string theory to heterotic string theory.
 * Sheldon conducts research at the California Institute of Technology, primarily in string theory.
 * Sheldon continues to be baffled and repulsed by human relationships.
 * Sheldon has 212 friends on MySpace.
 * Sheldon is allergic to bees and cats (despite having a pet cat as a child).
 * Sheldon has asthma.
 * Sheldon tells Penny that he had a bad experience in a Driving Simulator, even though in the episode with the simulator she was there.
 * Sheldon knocks on the doors three times before he actually enters, repeating after each knock the person's name who is inside.
 * Sheldon cannot detect sarcasm, but frequently asks if the comment made was.
 * Sheldon showers twice a day and washes his hands as often as he can.
 * Sheldon loves Star Trek, Battlestar Galactica, Doctor Who, Firefly and Scrubs, although he hates Babylon 5.
 * Sheldon's IQ is 187. (Though Sheldon says that his IQ is incapable of being accurately measured by any IQ test)
 * Sheldon considers himself to be a "Homo novus." A new, evolved species of homo sapiens.
 * Sheldon and his friends play Age of Conan where he is most likely a Conqueror by the name of Sheldor the Conqueror and has reached Level 80.
 * Sheldon and all of his friends play multiplayer online games. He is a rogue night elf in World of Warcraft.
 * Sheldon and his friends play Halo every Wednesday night, they call this ritual "Halo Night." Sheldon makes a big fuss about not starting at exactly 8:00pm and he must have the exact amount of time to play the game or else he takes the time out of eating or bathroom time.
 * Sheldon doesn't believe in luck or coincidence, instead citing the Law of Large Numbers (LLN) in statistics as the explanation for such phenomena.
 * Sheldon was sick a lot as a child (this eventually made him a mysaphobe).
 * Sheldon agrees with the theory that 75-80% of any Rock-Paper-Scissors games you play with a person you are familiar with end up in a tie, and accordingly he prefers the variation Rock-Paper-Scissors-Lizard-Spock (http://www.samkass.com/theories/RPSSL.html).
 * Sheldon has two siblings, one of whom is a (fraternal) twin sister who hostesses at Fuddruckers and the other, an older brother who often beat him up.
 * Sheldon has a red toothbrush that is kept in a Plexiglass case under a UV lamp.
 * Sheldon used a Doppler Effect costume for Halloween.
 * Sheldon loves superheroes, especially Batman, Green Lantern, and The Flash.
 * Sheldon likes to wear vintage t-shirts adorned with superhero logos.
 * Sheldon has a t-shirt of The Greatest American Hero's costume.
 * Sheldon goes to the Comic Book Store every Wednesday so he can see all the new comics on, "New Comic Book Day"
 * Sheldon uses his Green Lantern action figure as a safe place for his emergency money.
 * Sheldon wears briefs.
 * Sheldon makes weird noises when riding over a speed bump.
 * Sheldon knows Morse code very well.
 * Sheldon is terrible and constantly asks for things when he is ill. His friends have a protocol to hide themselves from him when it happens.
 * Sheldon has to sit on the far left side of the couch. Wherever he goes, he has to choose the best sitting location based on such things as optimal television viewing, lighting, airflow, and cushion density.
 * Sheldon hates it when someone stops him when he is trying to explain something. If this happens: a tic starts on his face until he can complete what he wants to say.
 * Sheldon doesn't know how to lie or how to keep a secret.
 * Sheldon has Leonard Nimoy's genetic and handwritten signature on a restaurant's napkin, given to him by Penny for Christmas.
 * Sheldon does his laundry every Saturday night at 8.15 p.m. and uses a FlipFold to fold his t-shirts.
 * Sheldon's favorite amino acid is Lysine.
 * Sheldon thinks that his very strong attention to hygiene and his skill in writing Java Applets are main reasons why his friends like him.
 * Sheldon can play the piano.
 * Sheldon labels all home utensils, appliances, etc.
 * Sheldon loves trains and monkeys.
 * Sheldon fears birds and (according to Raj) dogs.
 * Sheldon had a cat named Lucky when he was a child, and this cat died because it was hit by a train. Sheldon couldn't see the irony of the hit cat named Lucky.
 * Sheldon learned how to swim (on the floor) online.
 * Sheldon hates people who hiss at home.
 * Sheldon cannot stand whistling.
 * Sheldon doesn't like to go to the cinema alone because there is no guarantee that someone can help him with the Heimlich maneuver in the case he chokes on his popcorn.
 * Sheldon doesn't condone anyone to sit on his place on the sofa (left side).
 * Sheldon's arch-enemy was Leslie Winkle, but it is now Wil Wheaton. Upon see Wheaton, Sheldon will tense up and cry angrily "WHEATON!!!!"
 * Sheldon thought about creating a griffin when he was a child.
 * Sheldon loves to play Super Mario Bros.
 * Sheldon would like to control people in the same way he can control Mario in the video game Super Mario 64
 * Sheldon's favorite Star Trek movie is: Star Trek IV: The Voyage Home.
 * Sheldon thinks that having more than four friends at the same time is much too stressful for him.
 * Sheldon was very busy in his teenage years examining the range of diffusion in the supersymmetric theories, which brought him to re-examine the ultraviolet properties of supergravity a loop.
 * Sheldon's expenses account for 46.9% of his after tax income.
 * Sheldon cannot and will not drive. Someone must drive him always. However, in one episode, Sheldon once drove Penny's car to the Hospital, albeit badly.
 * Sheldon likes the movie Saturn 3.
 * Sheldon loves Star Wars but thinks the latest stuff by George Lucas is not so good.
 * Sheldon imposes and teaches behavior lessons to any friend of his who disappoint him for 3 consecutive times.
 * Sheldon's nickname is "Shelly" (although he only allows his mother Mary Cooper, his sister Missy, and Leonard to call him this).
 * Sheldon thrives off his work, and if left jobless he loses all focus and moves onto a new experiment/obsession every day, much to Leonard's dismay.
 * Sheldon does not like teddy bears because he thinks bears are terrifying.
 * Sheldon is considered 'one lab accident away from becoming a super villain'.
 * Sheldon loves having his brain scanned.
 * Sheldon hates when people pronounce the "t" in often.
 * Sheldon only shows genuine affection for one person, his grandmother (or Meemaw), whom he writes to.
 * Sheldon only condones one of his nicknames, "Moonpie", which his grandmother calls him.
 * Sheldon plays bass guitar on rock band.
 * Sheldon is a Taurus placing his birthday between 20 April and 21 May.
 * Sheldon, though unwilling to fight, is physically the strongest of the group, easily holding his own against Raj in an arm wrestle, and once referred to Leonard and Howard as 'tiny tiny men'.
 * Sheldon's little toe is degenerated, purportedly due to his high level of evolution which keeps him from using a motor vehicle.
 * Sheldon once got chased up the elm tree at the front of his house by his neighbour's chicken.
 * Sheldon once took a bet with Howard about a species of cricket, but lost and had to give Howard his Flash comic book.
 * Sheldon's middle name is Lee, according to his Stevenson Award.
 * Sheldon went to a Science Fiction convention on a bus for 10 hours and violated his personal rule of not urinating on buses twice to see Wil Wheaton, who didn't show up at the convention. This and the events of the tournament and bowling alley, led Sheldon to consider Wheaton his arch nemesis. He has made three websites dedicated to hating him: wilwheatonstinks.com, .org and .net.
 * Sheldon has actually been kind to Penny; in two episodes he actually drove her to the hospital because she dislocated her shoulder, and loaned her a significant amount of money to help her in a financial pinch. (even though this through Penny to think everyone was drilling her on her financial situation, even when they werent).
 * Sheldon buys his t-shirts at Comic Book Store.
 * Sheldon's favorite actress playing Catwoman is Julie Newmar and his least favorite is Halle Berry.
 * Sheldon was once offered a position at a secret military base, but was later forced to deny the position due to his inability to keep secrets.
 * Sheldon hates it when people change the contrast of the TV settings, talk to him through the bathroom door, change Band-Aids in front of him, buy generic ketchup, forget to rinse the sink, adjust the thermostat, or cook with Cilantro.
 * Sheldon thought that the trip he and his friends took to the North Pole in Season 2/3 was "a hoot and a half."
 * It was mentioned that Sheldon and Leonard once had (before they were robbed) "A TV, 2 laptops, 4 external hard drives, a PS2, PS3, Xbox, Xbox 360, a classic Nintendo, a Super Nintendo, a Nintendo 64, a Nintendo Wii, Halo 1-3, Call of Duty 1-3, Rock Band 1-2, Final Fantasy 1-9, Legend of Zelda, Legend of Zelda: Ocarina of Time, Legend of Zelda: Twilight Princess, Super Mario Bros., Super Mario Galaxy, Mario and Sonic at the Winter Olympics, and Ms. Pac-Man.
 * Sheldon onced asked Leonard if he wanted to play Super Mario 64 with him even though, Super Mario 64 is a 1 player game only.
 * Sheldon has adhesive ducks holding umbrellas in his bathtub to prevent slipping.
 * When Sheldon was 12, he had to be flown to a hospital by helicopter and be treated for radiation damage following a mishap when he built a CAT scan which also resulted in the death of his sister's guinea pig, Snowball.
 * Sheldon keeps a daily log of social interactions called Sheldon's Log ( in place of Captain's Log)
 * Sheldon doesn't trust banks because he believes that ATM machines will lead the robot armies when they revolt against humans.
 * Sheldon keeps band-aids with him at all times as well as in his kitchen, top desk drawer, etc.
 * As of The Excelsior Acquisition, Sheldon has a restraining order from Stan Lee as well as Leonard Nimoy.
 * Sheldon has an in depth knowledge of American Football, since he was raised in Texas and his father would force him to watch it from the time he was four until he went off to college—the longest 7 years of Sheldon's life.
 * Sheldon only drinks hot chocolate in months whose names involve the letter r. When asked why, he justifies this prediliction with the statement "What is life without whimsy?-".
 * Sheldon is also quite a skilled pick pocket, although it is not explained when he obtained this skill.
 * Sheldon has trouble understanding sarcasm.
 * Sheldon rarely laughs, but when he does, it is a quick internal breath and a small smile
 * Sheldon has never worn a shirt with words and always wears a long sleeved shirt under a t-shirt
 * Sheldon is a fan of the show Firefly (and once believed in 2003, that it would run for years) and considers the shows cancelation a betrayal that rivals that of Judas Iscariot.
 * Sheldon got drunk two times during the series: at the end of The Grasshopper Experiment and in The Pants Alternative and in the last he showed a sense of humour and irony above he normally has.
 * Sheldon fears Morlocks.
 * Sheldon apparently believes in the possibility of time travel to the past according to the beginning of The Luminous Fish Effect, explanations of time paradoxes in The Nerdvana Annihilation and a point of the room-mate agreement in The Staircase Implementation.
 * Whenever Leonard, Howard, Raj or Penny call him insane or crazy, he usually denies this by saying that his mother had him tested for insanity.
 * When somebody is distressed, Sheldon consoles them by saying "There, there"- only proof of his compassion towards other fellow human beings.
 * Sheldon is scared of waking Penny before 11 am.
 * Each day, Sheldon has a specific pajama to wear. In the case of a stain, he still would not swap a pajama. He would rather sleep without bottoms as seen in The Barbarian Sublimation, when he spilled grape juice on his bottoms.
 * Sheldon is skilled in weaving as he is seen weaving ponchos in his apartment.
 * If nothing is approved by Sheldon, he will not go through with it. (This is seen when Leonard, Raj, Howard, and Sheldon are trying to figure out the best way to see a movie. With Sheldon not approving any ideas, the rest leave him and he responds: "They're right. That was the only way.")
 * Sheldon once broke into Penny's apartment to clean it.
 * Once Leonard, Raj, and Howard signed Sheldon up on a dating site and the site found Sheldon's perfect match, but Sheldon refused to go until Raj told him that he put a dirty sock in his apartment and would not remove it unless Sheldon went on the date.
 * Prevening- Sheldon's made up word for the hours too late for Afternoon, but too early for evening.
 * Leonard had to surpass 3 barriers set by Sheldon in order to live with him.
 * Sheldon once attempted to teach Penny Physics... 'Twas an epic failure.
 * Sheldon prefers the word "Hookum" to Bogus, Hokus Pokas, Mumbo Jumbo and Hokie Pokie.
 * Sheldon is terrified of dirty socks.
 * Sheldon cannot stretch to touch his toes.
 * When Leonard moves in with Sheldon, the wall in Leonard's room had "Die Sheldon Die" written on it, written by his previous roomate.
 * He denies that Amy Farrah Fowler is his girlfriend.
 * Sheldon thinks Icees are not slushees.
 * He missed getting Stan Lee to autograph his comic since he had to go to traffic court to pay a fine, but ended up in jail after he insulted the judge and refused to apologise.
 * In Texas, Sheldon was the co-captain of the East Texan Christian Youth Holy Roller Bowling League Championship team, 7-12 year old division.
 * Sheldon had built a robot called Shelbot, but was eventually discarded since Penny and Leonard were quite annoyed at Sheldon's idea for doing so.