(S4, E31): Perhaps the most famous episode of the entire franchise. A massive sugar rush transforms Beavis into his legendary alter ego, Cornholio, who wanders the school demanding "TP for my bunghole". No Laughing
While the show produced over 200 episodes across its original run and revivals, a few stand out as the gold standard of animated stupidity: THE BEST OF BEAVIS AND BUTTHEAD
Before the series exploded, Mike Judge created two crudely animated shorts for Liquid Television in 1992. These are the raw, unvarnished proto-Beavis and Butt-Head. They are darker, weirder, and arguably funnier. (S4, E31): Perhaps the most famous episode of