Sheldon can now die happy. On this episode of The Big Bang Theory, he meets Stephen Hawking!
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Has Raj met the future Mrs. Koothrappali? He sure thinks so in this scene from The Big Bang Theory.
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Sheldon is seen here playing video games. Instead of going to Amy's aunt's birthday party, that is.
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Whoa, what's going on here?!? The gang looks down at Sheldon's odd hairstyle in this scene from The Big Bang Theory.
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What, is this a weird gift? Amy really doesn't see anything wrong with is.
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Sheldon works here with Amy in the lab. This is his version of a vacation.
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Sheldon is a nice guy. But he can also be a very demanding friend toward Leonard, as evidenced here.
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They're back together! All seems right in the world when Penny is dating Leonard, don't you agree?
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TBBT Quotes

Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy?
Sheldon: There are post-prom mating rituals?
Penny: Not always. Unless your date drives a van with an air mattress, then always.
Sheldon: Well, if it's part of the prom experience, then I'm open to it.
Penny: You're kidding.
Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.

Leonard: Hi. I'm Leonard. You are beautiful. You pop, sparkle and buzz electric. I'm going to pick you up at eight, show you a night you will never forget.
Raj: Where are we going?