The sound comes from the McDonnell Douglas MD-80, a twin-engine airliner introduced in 1980 and widely flown by major airlines for decades. Its overspeed warning uses a distinctive clacker to alert pilots that the aircraft has passed its maximum operating speed. Flight simulator players know the noise well from virtual cockpits, where pushing the throttles too far triggers it during climbs and descents. Clips of the warning later spread through aviation forums and video edits, becoming a reusable shorthand for any machine moving faster than it should.