Air horns have long been used at sports matches, parades and parties to make noise that carries across a crowd, and the sound moved naturally into online video as a ready-made celebration cue. Creators use the same short blast to mark goals, wins and dramatic entrances, while DJs and streamers use it to hype an audience. Because it is instantly recognisable and needs no explanation, it has stayed popular for reaction videos, sports edits and meme compilations where a single loud moment has to land immediately.