The episode where he sends mail to NASA... I did that, too, with a design for a shuttle. What I did not do is follow up w/ a trip to the office and show off my ground breaking higher-level math; I was in 3rd grade and my "design" was an utterly useless 3rd grader's drawing. It didn't even have 3D perspective.
My favorite so far, though, is when the physics prof that Sheldon idolizes mentions to his SO while eating vanilla ice cream that some vanilla "extracts" are actually extracted from beaver anal glands. I laughed especially loud at this one because I have literally shared this same factoid with exactly the same bad timing. :D
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