Air horns have long been used at sports matches, parties and celebrations to make a loud, attention-grabbing noise, and that same sound moved online as a short meme clip. Creators began using the blast as a joke entrance cue, playing it whenever someone arrived, appeared or was caught off guard, because the sudden noise instantly changes the mood of a scene. It spread through gaming streams, reaction videos and short-form edits, where a one-second sound can carry the whole joke, and it remains popular because it needs no explanation.