Lo Squalo is the Italian title for Jaws, Steven Spielberg's 1975 shark film, and its score by John Williams turned a simple two-note pattern into one of cinema's most famous warnings. The motif was designed to suggest a shark moving unseen beneath the water, and audiences learned to feel dread long before the animal appeared. Decades later, editors and meme creators reuse the same rising pattern whenever danger approaches in a clip, because it instantly tells viewers that something is about to happen.