(Starting this one a bit early so I have enough time to track down a copy of any really strong recommendations you might have)

Pretty self explanatory, what would you play at a Halloween party? You can go obvious, tacky, bizarre, creepy, obscure, fun, whatever you like.

I'll throw a few starters in:
http://www.youtube.com/watch?v=lp0-kG269FM
http://www.youtube.com/watch?v=JWnPWHtkJ6Y
http://www.youtube.com/watch?v=YaOmWf7-6io