It is from a SNL skit about BOC. Freaking hilarious. Do a search for it on You Tube, should be able to find the whole clip.
*edit-well, there you go
Metallica is high up on my list, but mainly the older stuff. I used to listen to a lot of harder stuff, but Tool is about it right now. Early NIN was very heavy also. I listen to a LOT of Deftones, but wouldn't really call them Metal, especially the new album. Korn also; again, mainly the older stuff.