Unlike a quote from a film or show, crowd laughter is a classic stock sound effect used in sitcoms, radio comedy and live recordings for decades to signal that a joke has landed. Online, creators reuse the same idea in a much shorter form, dropping a few seconds of audience laughter over edits, memes and gameplay clips to make a moment feel shared. It remains popular because it is instantly understood without any context, works across languages, and turns a single funny moment into something that feels like a group experience.