The signpost comes from Sega's Sonic the Hedgehog series, which debuted on the Genesis in 1991. At the end of most classic stages, Sonic runs past a rotating signpost showing Robotnik, and the panel spins to reveal Sonic's face to confirm the clear. The effect became especially familiar through later entries like Sonic 3, where players heard it after almost every act. Clips of the spin were later shared on soundboards and in gaming edits, keeping it popular as a universal level complete cue.