The Nerdvana Annihilation

Summary
Leonard accidentally buys a full size prop of the time machine from the movie The Time Machine. As the guys attempt to bring it up to their apartment they block the stairs and Penny ends up missing work. She scolds Leonard for having all these toys and so he tries to get rid of them all. But Sheldon points out Penny’s hypocrisy and she apologizes.

Quotes
[upset by Penny's comments, Leonard sits in the time machine]

Sheldon Cooper: Leonard, it's two in the morning.

Leonard Hofstadter: So?

Sheldon Cooper: So, it's my turn.

Leonard Hofstadter: What if I knock you unconscious right now?

Sheldon Cooper: It won't change the past.

Leonard Hofstadter: But it'll make the present so much nicer.

Penny: That's not a time machine. If anything, it looks like something Elton John would drive through the Everglades.

Sheldon Cooper: [to Penny] You hypocrite! Miss "grown-ups don't play with toys!" If I went into your apartment right now, would I not find Beanie Babies? Are you not an acquirer of Care Bears and My Little Ponies? And just who is that Japanese feline on your shorts? Hello, Hello Kitty!

Trivia

 * Including shipping, Howard works out that purchasing a Time Machine is less than $4/pound, whereas cocktail shrimp are $12.50/pound
 * Leonard's first time trip he chooses to be March 10th, 1876, the date Alexander Graham Bell made the first call on his new invention, the telephone. Though to solve the technical issue of traveling across space as well as time, and explaining his presence to Mr. Bell, Sheldon suggests going forward in time to obtain a Cloaking device|cloaking device. In the Star Trek series, Captain Kirk steals on on stardate 5027.3, which converts to January 10, 2328.
 * Raj encourages Howard to "look up 'dibs' in Wikipedia" to validate his claim to Leonard's Golden-Age Flash action figure. Here is what Wikipedia has to say about Dibs.
 * The mint-in-the-box action figure Leonard threatens to open if his friends don't let him pass is a "rare, mint condition, production error Star Trek: The Next Generation Geordi La Forge without his VISOR in the original packaging"
 * Leonard spends $800 on a full scale Time machine.
 * Raj said he will match the offer for Leonard's collectibles plus a 1000 Rupees and Sheldon asked "What's the exchange rate?". Raj replied "None of your business". 1000 Indian Rupees is approximately 22 USD.

Critics
"An excellent story which showcases the three main characters and their dichotomy perfectly. It also advances the overall story of Leonard trying to become the right man for Penny. With the time machine providing some laughs this is an excellent episode overall." - The TV Critic's Review