It's Christmas on The Big Bang Theory! Howard simply awfully happy about it here.
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The gang wonders what their lives would have been like if they'd never met Sheldon on The Big Bang Theory. "The Cooper Extraction" is the 11th episode of the show's seventh season.
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Sheldon must deal with the shame of having his discover disproved on The Big Bang Theory. "The Discovery Dissipation" is the tenth episode of the show's seventh season.
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It's Thanksgiving on The Big Bang Theory. This is a photo from Season 7 Episode 9.
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This is a photo from "The Itchy Brain Simulation." It's Episode 7 of The Big Bang Theory Season 8.
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Sheldon looks unhappy with his dinner prospects on The Big Bang Theory. "The Thanksgiving Decoupling" is the ninth episode of the show's seventh season.
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It's Bob Newhart on The Big Bang Theory! This is a photo from "The Proton Displacement."
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Sheldon makes Leonard pays for a past mistake on The Big Bang Theory. "The Itchy Brain Simulation" is the eighth episode of the show's seventh season.
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TBBT Quotes

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

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.