Air horns have long been used at sports games, parades and celebrations to make a loud, attention-grabbing noise, and that real-world use carried straight into online video. Creators began dropping the short blast over fails, wins, pranks and reaction clips because it instantly signals excitement or absurdity without any words. Its brevity makes it easy to reuse across memes, edits and streams, and because the sound is instantly recognisable, it still works as a quick audio punchline years after it became a staple of internet humour.