Wil Wheaton is back! And he's hosting a party at his house here.
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The boys are concerned about Raj here, but all we be okay. He meets a girl he can actually talk to on "The Wiggly Finger Catalyst."
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You're looking at a photo from "The Pulled Groin Extrapolation." Sheldon and Leonard have a lot to discuss.
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You're looking at a scene from The Infestation Hypothesis. It's episode two of season five.
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Leonard confronts Penny in this scene from the season five premiere of The Big Bang Theory. She sure finds something funny!
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The gang is all here. And we mean everyone! Check out this scene from the fifth season premiere of The Big Bang Theory.
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This is awkward for everyone. Raj and Penny stand in front of the boys on the fifth season premiere.
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Sheldon takes charge of the paintball team on the season five opener. Is this really a good idea?
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We all know what happened between Penny and Raj on the season four finale. Here they are on the ssason five premiere.
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Amy has so many questions for Penny on the season five premiere. They are all based on sleeping with Raj.
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Bernadette reacts to the news here. Yes, Raj did Penny!
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Really, Penny?!? Amy has the question you'd expect her to have in this scene from the season five premiere.
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TBBT Quotes

Penny: What actor holds the record for being named People magazine's Sexiest Man Alive?
Sheldon: William Shatner!
Leonard: I don't think it's Shatner.
Sheldon: Then it's got to be Patrick Stewart

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.