This one, from one of my favorite hip-hop albums, Labcabincalifornia. At first 20-30 seconds or so it seems like an ordinary video with guys dancing around and bragging about stuff, but when you finally get to see the trick behind it, it may blow your mind. I can only imagine how much trouble they got through to not only film, but properly lipsync all of it.
The whole video is in reverse. Yep, without any special effects