Intro to Reality by anthrax, minus the talking
EDIT:
Ooh I've got a GREAT one...
Spiderbaby by White Zombie, if you're not familiar with it it's from the album La Sexorcisto No. 5
EDIT x 2:
Ok this is such a phenomenal recommendation that you HAVE TO USE THIS AT LEAST ONCE. If you don't, at least lie to me and tell me you did so I can rest peacefully at night.