Here is a look at Sheldon in an unusual outfit. It's a photo from The Big Bang Theory episode "The Skywalker Incursion."
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Raj and Amy offer to settle an argument with a game of ping pong on The Big Bang Theory. "The Skywalker Incursion" is the 16th episode of the show's eighth season.
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Hey, what you working on? Sheldon sneaks a peek in this scene from The Big Bang Theory.
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The gang gets together for a family dinner in honor of Mrs. Wolowitz on The Big Bang Theory. "The Leftover Thermalization" is the 18th episode of the show's eighth season.
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Amy finds out that Sheldon applied for a one-way trip to Mars on The Big Bang Therapy. "The Colonization Application" is the 17th episode of the show's eighth season.
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Penny and Sheldon design an experiment made to get the participants to fall in love on The Big Bang Theory.
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Leonard and Raj run into a restaurant customer who looks just like Nathan Fillion. "The Comic Book Store Regeneration" is the 15th episode of the show's eighth season.
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The girls remember some of their most embarassing moments on The Big Bang Theory. "The Troll Manifestation" is the 14th episode of the show's eighth season.
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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