The motif comes from John Williams's score for Steven Spielberg's 1975 film Jaws, where it signalled the unseen great white shark approaching its victims. The two-note figure became one of the most recognised pieces of film music ever written, helped by the movie's huge success and repeated use in trailers, parodies and television. On social media it is now used as a quick audio cue for danger, suspense or an unwelcome arrival, even when no shark is involved, because audiences instantly understand what is coming next.