The overspeed warning is a standard aural alert in Boeing cockpits, built to warn pilots the instant an aircraft exceeds its maximum safe speed. Its distinctive clacker sound has become familiar far beyond aviation through flight simulators, cockpit recordings and aviation videos shared online. Short clips of the warning now circulate on soundboards, where creators borrow its sense of urgency for fast cars, runaway objects and jokes about going too far. It endures because the sound needs no explanation: it instantly signals danger, speed and loss of control.