Stan Lee rocks an amazing set of Fantastic Four pajamas when Penny and Leonard come to visit him at his home unannounced.
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When Leonard goes to surprise Penny with a trip to Switzerland, he makes her a plate of Swiss hints.
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On the 3/1/10 episode of The Big Bang Theory, Sheldon ends up in jail. Don't worry. He'll get bailed out.
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This photo is taken from "The Einstein Approximation." During the half hour, Sheldon continues to search for the answer to a physics problem.
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After some security concerns after a break in, Sheldon finds himself sneaking out on his ledge.
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Penny and Leonard come outside to see Sheldon trapped by a net from the security system they installed.
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When Sheldon and Raj get a security system installed to combat intruders, it back fires on them.
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When the boys' apartment gets broken into, they call upon Wolowitz to help them install a security system.
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TBBT Quotes

I was expecting applause but I suppose stunned silence is equally appropriate.

Sheldon

Sheldon: Nothing more fun than a paradigm shifting evening of science.
Penny: (to Leonard) And you thought it was soaping me up in the shower.