Composed by John Williams for Steven Spielberg's 1975 thriller Jaws, the main theme uses two alternating low notes to represent the unseen great white shark approaching its victims. Williams won an Academy Award for the score, and the motif quickly left the cinema to become pop culture shorthand for impending danger. Parodied in comedies, adverts, and countless online edits, it is instantly recognised even by people who have never seen the film, which is why creators still use it whenever a slow, inevitable threat is the joke.