This joke comes from Wayne's World, the comedy film built around Wayne Campbell and his best friend Garth Algar, where deadpan wordplay and crude punchlines were part of the humour. The sphincter line works as a classic playground-style reversal, turning an innocent 'what?' into the punchline itself. Shared as a short soundboard clip, it travelled through meme edits, reaction videos and prank compilations, where its brevity makes it easy to drop into almost any conversation. It endures because the setup is instantly understood, even by viewers who have never seen the film.