Unlike sounds taken from a film or viral clip, this is a generic vehicle effect with no single famous origin, which is why it works so well as a piece of stock audio. The reversing beeper is a standard safety warning fitted to trucks and vans, so listeners recognise it instantly from real streets, car parks and loading bays. Online, editors reuse it whenever they need an instantly readable cue for something large moving backwards, from delivery and trucking videos to prank edits and cartoon-style fails, because the tone alone tells the story without explanation.