Don't ask me why, but ever since my mother played me Fred Astaire's "Singing in the Rain," I've been fascinated by random dancing and singing in movies. It's the funniest stuff! Everybody gets up and breaks loose in perfectly choreographed routines right in the middle of conversations, and it seems totally plausible. And let's not even talk about "Cop Rock." How'd that show fail? Well, with the popularity of Dancing with the Stars, Glee and a soon to be remade "Footloose," we like that we could capture the greatest dancing in movie history in just 4 minutes and 45 seconds, rather than sit through all the movies.