Beavis' Peyote Trip
Beavis' peyote trip. First Butt-Head melts into four miniature demonic versions of himself...and then things just completely go off the rails from there. Beavis turns into a zombie, all kinds of monsters dance around to hellish and macabre backgrounds, and Beavis and Butt-Head turn into assorted monstrous versions of themselves and at one point shake the skin off their skulls. It's so unlike anything else in the series and it Makes Just as Much Sense in Context.