The Boeing 757 is a narrow body airliner that entered service in 1983, and its cockpit warning system includes a clacker that sounds when the speed limit in the current configuration is exceeded. Pilots train with that noise in simulators, so recordings and simulator recreations spread widely among aviation fans online. Flight simulation videos, cockpit compilations and meme edits later borrowed the clacker as shorthand for going dangerously fast, giving a real safety warning a second life outside the flight deck.