The air horn is a classic stadium and celebration sound, long used at sporting events, parties and parades to grab a crowd's attention with a loud, brassy blast. Online, creators adopted the same sound as a shorthand for hype, turning a single blast into repeated bursts for bigger reveals, wins and jokes. The five-blast version fits short-form video perfectly because it is loud, instantly recognisable and over in just over two seconds, making it easy to drop over a highlight, a reaction or a punchline without slowing the edit down.