What's cooler than being cool? How about an infectious dance track that took a double-album triple platinum in a month flat, simultaneously becoming the first song to ever reach a million downloads on iTunes? This week, we break this thing down for just a few seconds: How OutKast's "Hey Ya" inspired a generation to shake it like a Polaroid picture, blissfully ignoring a not-so-hidden message about the bleak state of modern love. Guest appearances by Rosario Dawson, the Beatles, Woody Allen (regrettably), Ryan Phillippe, and of course, all Beyoncés and Lucy Lius .... you know what do.