Air horns began as loud signalling devices at sporting events, parades and celebrations, where a single blast could be heard over a crowd. Online, that same blast became a staple of meme edits, gaming montages and reaction videos, where it marks a moment of triumph, surprise or absurd confidence. Its brevity makes it easy to drop into short clips without breaking the pace, and its instantly recognisable tone still signals hype today, even in videos that have nothing to do with sport.