Unlike sounds tied to a single show or meme, AM radio static is a generic effect with no single origin, drawn from the real interference heard when an analogue radio searches for a station. It has been used for decades in radio drama, film and television to suggest tuning, distance, a lost signal or a broadcast from another time. Online, editors adopted the same texture for short videos, horror edits and lo-fi transitions, where its rough, imperfect quality reads instantly even in a few seconds. That familiarity keeps it useful across genres.