The sound comes from the Road Runner, known in Brazil as Papa-Léguas, the fast bird from Warner Bros. Looney Tunes cartoons who constantly outruns Wile E. Coyote. His short two-note call became his trademark, instantly telling viewers he had arrived or vanished at impossible speed. Through decades of television reruns, the call moved beyond cartoons into everyday comedy, reaction videos and internet memes. Creators still use it because it needs no explanation: two quick notes alone can suggest speed, escape and a joke landing at once.