I didn't think there was any way Jimmy Kimmel and Ben Affleck could top the Sarah Silverman and Matt Damon video.
But, oh, did they. OH DID THEY. It helped of course that they managed to Huey Lewis, Harrison Ford, Don Cheadle, Brad Pitt (amaaaaaazing), Robin Williams, ETC. ETC. to join in. In any event it's amazing. But v. NSFW.