The dun dun duuuun sting belongs to a long tradition of dramatic musical cues used on stage and screen to signal a revelation, a twist or an unwelcome surprise. Short, instantly recognisable and easy to drop into any clip, it travelled from television drama into online video, where creators began using it ironically for everyday reveals, from opening a fridge to announcing exam results. Its staying power comes from that contrast, because the serious, ominous sound makes a small moment feel momentous, and audiences know exactly what is coming as soon as the first two notes play.