Nelson Muntz is the school bully in The Simpsons, the long-running animated sitcom that premiered in 1989, and his pointed 'Ha ha!' became one of the show's most quoted catchphrases. Voiced by Nancy Cartwright, the laugh usually follows another character's humiliation, making it shorthand for schadenfreude. As clips from the series circulated online, that brief taunt was lifted into soundboards, ringtones and reaction videos, where it still signals instant mockery even for viewers who have not seen the original episode in years.