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

You can't ruin a friendship with sex that's like trying to ruin ice cream with chocolate sprinkles.

Raj

Sheldon: Even the dung beetle chooses to plot its course by using the Milky Way.
Raj: Is that true?
Sheldon: Everything I say is true. Now, of course, the dung beetle also enjoys eating fece, living in feces and making little balls out of feces. So, pick and choose which aspects of its lifestyle you want to embrace.