Leonard does his best to console Penny on The Big Bang Theory. "The Hesitation Ramification" is the 12th episode of the show's seventh season.
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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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TBBT Quotes

Sheldon: Are you still mad about the sperm bank?
Leonard: No!
Sheldon: Do you want to hear an interesting thing about stairs?
Leonard: Not really.
Sheldon: If the height of a single step is off by as little as two millimeters most people will trip.
Leonard: I don't care—two millimeters?! That doesn't seem right.
Sheldon: No, it's true! I did a series of experiments when I was twelve; my father broke his clavicle.

Penny, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon