Homer Simpson, voiced by Dan Castellaneta on The Simpsons since 1989, is known for drawn-out reactions that translate easily into short clips. His boo became a reusable reaction sound online because it needs no context, the disapproval is clear from the first second and the long tail works as comic timing. Clips like this spread through meme edits, gaming videos and soundboards, where editors keep a library of TV reaction noises ready to drop over fails, bad takes and anticlimactic endings.