Remember when Beavis and Butthead would stand there playing air guitar and singing Black Sabbath songs? "Dah dah dah-dah-dah!" Jud Jud actually do that - two guys making acapella metal originals (no Sabbath covers - yet) like "Fast Song." They sing all instrument parts, even do drum fills and that double-bass drum roll so common in thrash-land. Unlike their cartoon contemporaries, however, they're deadly serious. Which, of course, makes them all the more funny.
Entire Jud Jud albums to listen to here.