Your daily pop-culture trivia: Check out this nifty video explanation of the Wilhelm Scream, which you have undoubtedly heard, even if you have not heard of it.
More about the scream, including examples and the inevitable YouTube jokester, after the jump...
And then watch this clip demonstrating just how ubiquitous the famous scream really is.
I feel kind of bad now for all the sound editors whose inside joke has been ruined. At any rate, complete your studies with this compilation of scenes that should, but don't, feature the Wilhelm Scream: