Nelson Muntz is the school bully from the long-running animated series The Simpsons, and his mocking ha ha has become one of the show's most quoted catchphrases. The laugh is usually aimed at another character's misfortune, which is why it translates so easily outside the show. As short clips and soundboards spread online, the two-beat taunt became a shorthand reaction for schadenfreude in memes, streams and edits. It endures because it is instantly recognisable, requires no setup and delivers the joke in just over a second.