The sound comes from the siren fitted to the Junkers Ju 87 Stuka, the German dive bomber used throughout the Second World War. Nicknamed the Jericho Trumpet, the propeller-driven siren was designed to terrify people on the ground as the aircraft attacked, and its scream became one of the most recognisable sounds of the war. It later entered films, documentaries and war games, where it became shorthand for an air attack. Online editors adopted it for the same reason, using its instant association with falling danger to make edits feel more dramatic or absurd.