The rubber bulb bicycle horn dates back to early cycling culture, when a simple squeezed honk was a practical warning on crowded streets. Its squeaky double tone later became a stock cartoon sound, linked to clowns, delivery bikes and slapstick chases. Online, creators borrowed that familiar cue for short form edits because it is readable in under two seconds, unlike the louder air horn used for exaggerated reactions. It now appears in meme compilations, kids content and gameplay highlights as a shorthand for a silly arrival, a near miss or a mock warning.