The phrase comes from the ground proximity warning system fitted to commercial airliners such as the Boeing 737, which monitors altitude and terrain ahead and issues a spoken pull up command when a collision risk is detected. The same alert is heard in real cockpit recordings and in flight simulators, where it has become familiar to aviation enthusiasts. Online, the clip spread through flight simulator videos, aviation fail compilations and reaction edits, where creators use the recognisable warning to signal imminent danger, a bad landing or a sudden drop in any vehicle.