Awkward Date

Sheldon requires a chaperon on his first date when season four of The Big Bang Theory kicks off. Penny is chosen for the job.
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A Request for Penny

Sheldon has a request for Penny on the fourth season premiere of The Big Bang Theory. Will she tag along on a date with him?
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The Roommate Agreement

A flashback to when Leonard first moved in with Sheldon and they signed the roommate agreement.
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Sheldon and Amy

Sheldon runs into a character played by Mayim Bialik on the 5/17/10 episode of The Big Bang Theory. Might she be the one for him?
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Big Bang Scene

You gotta love this guest-starring appearance on The Big Bang Theory: that's former sitcom star Mayim Bialik!
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Wil Wheaton Bowling

A picture after Wil Wheaton just bowled as Sheldon prepares to counter.
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Wheaton Calls Out Sheldon

Wil Wheaton calls out Sheldon as the two of them meet in the bowling alley.
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The Wesley Crushers

Sheldon has a shirt made that says "The Wesley Crushers" for his bowl off with Wil Wheaton. Get it? No? Wheaton played Wesley on Star Trek.
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Sheldon Vs Wheaton

Sheldon goes up against Wil Wheaton in the ultimate bowl off between rivals.
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Nerd Bowl Off

Sheldon goes up against his nemesis, a characterized version of Wil Wheaton, in bowling on The Big Bang Theory.
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Sheldon in Jail

On the 3/1/10 episode of The Big Bang Theory, Sheldon ends up in jail. Don't worry. He'll get bailed out.
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What's the Answer?!?

This photo is taken from "The Einstein Approximation." During the half hour, Sheldon continues to search for the answer to a physics problem.
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TBBT Quotes

Oh, Bernadette, please play my clarinet.

Raj's poem

Sheldon: I'll have a diet Coke.
Penny: Can you please order a cocktail? I need to practice mixing drinks.
Sheldon: Fine... I'll have a virgin Cuba Libre.
Penny: That's... rum and Coke without the rum.
Sheldon: Yes, and would you make it diet?