The Tenacious D video of "Tribute" is pretty damn cool. For those of you who aren't familiar with Tenacious D, it's a rock band with Jack Black and Kyle Gass. Jack Black's somewhat hyperkinetic acting style is pretty well reflected in his music, and the video is hilarious. I also found a Flash animation video they did called "F*ck Her Gently." This one is also pretty funny, although definitely NSFW.