Mike Patton is a maniac. And seeing something like this performed live is about as impressive as hearing it. Because hearing it, I thought, "This sounds like Mr. Bungle trying to write the musical score to a Looney Tunes cartoon while falling down an elevator shaft in an elevator car with spotty brakes." And then, looking at Wikipedia, it appears I at least got the flavoring right.
And, for Doc especially, their take on some of Angelo Badalamenti's work on Twin Peaks after the break.