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Amy vs. Penny
Watch The Big Bang Theory Season 5 Episode 1
"The Skank Reflex Analysis"
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The Big Bang Theory is back! On the premiere, the gang deals with Penny and Raj actually sleeping together.

New Roomies
Watch The Big Bang Theory Season 4 Episode 24
"The Roommate Transmogrification"
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Raj moves in with Sheldon on the fourth season finale of The Big Bang Theory. This takes Penny by surprise.

Kunal Nayyar Promo Pic
Watch The Big Bang Theory Season 4 Episode 23
"The Engagement Reaction"
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When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.

Raj in Action
Watch The Big Bang Theory Season 4 Episode 22
"The Wildebeest Implementation"
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Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.

Sheldon Busts a Move
Watch The Big Bang Theory Season 4 Episode 21
"The Agreement Dissection"
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When Priya uses her lawyer skills to pick apart the roommate agreement, the girls take Sheldon dancing on this episode of TBBT.

Sheldon and Amy Photo
Watch The Big Bang Theory Season 4 Episode 20
"The Herb Garden Germination"
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Sheldon and Amy spread gossip this week. Elsewhere, Howard takes a big step in his relationship with Bernadette.

Nerds on a Mission
Watch The Big Bang Theory Season 4 Episode 19
"The Zarnecki Incursion"
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Someone has the gall to hack into Sheldon's online game account this week. The guy go on a search to find out who would dare do such a thing.

Hi, Couple!
Watch The Big Bang Theory Season 4 Episode 18
"The Prestidigitation Approximation"
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Wolowitz baffles Sheldon this week with a magic trick. Elsewhere, Leonard realizes that there's a problem with him dating Priya.

The Toast Derivation Scene
Watch The Big Bang Theory Season 4 Episode 17
"The Toast Derivation"
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Sheldon struggles with a realization on this episode: Leonard who is actually the center of the social group.

The Cohabitation Formulation Scene
Watch The Big Bang Theory Season 4 Episode 16
"The Cohabitation Formulation"
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Wolowitz considers going all the way with Bernadette this week. Elsewhere, Leonard rekindles his relationship with Raj's sister.

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TBBT Quotes

Stephen Hawking: You made an arithmetic mistake on page two. It was quite a boner.
Sheldon: No, no ... that can't be right. I-I don't make arithmetic mistakes.
Stephen Hawking: Are you saying I do?
Sheldon: Oh, no, no, no, of course not. It's just, I was thinking.... Oh, gosh, golly, I made a boo-boo and I gave it to Stephen Hawking.
Stephen Hawking: Great, another fainter.

Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock?
Penny: It's not "soup," it's "courage."
Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup.
Penny: How'd you see it? You said you wouldn't look.
Sheldon: Sorry. As I told you, the hero always peeks.