Autopilot is Tesla's driver-assistance system, and its engagement chime is part of the car's in-vehicle alerts, designed to confirm the system is active without startling the driver. Clips of Tesla interiors, test drives and owner reactions spread across YouTube and TikTok, turning the sound into a shorthand for self-driving cars. Creators now reuse it far beyond car videos, using the familiar tone to suggest automation, laziness, luxury or a future where machines handle everyday tasks.