(1) Dig this crazy link
(2) Once there, click in the box where it reads 'Play'
(3) Sit back, relax, and enjoy.
N.B.: This isn't particularly workplace friendly. If your kids see you laughing at it, they'll get the wrong idea that you're cooler than you actually are. Anyone with a penis might not find it as amusing as those of us who don't. You've been warned.