Anything on threeframes.net is pretty cool. It's just 3 frames of random movies turned into an animated gif. Watch them long enough and you'll swear they are in 3D.
i'm going to link as its a bit nasty (like, fucking nasty) football tackle from the Belgian league. http://i898.photobucket.com/albums/ac189/MTphotodump/33e1wfd.gif