Showtime horns have long been used in theatre, circuses and live events to gather attention before a performance begins, and that same theatrical shorthand carries over to online video. On soundboards and in meme edits, the short air horn blast is dropped as a universal signal for a reveal, a grand entrance or a joke landing with extra confidence. Its appeal is its simplicity: listeners understand the cue instantly, even without context, which is why creators keep returning to it for intros, transitions and punchlines across short-form video.