The sound comes from Five Nights at Freddy's, the 2014 indie horror game in which a night guard survives until 6 a.m. while avoiding animatronic characters. Completing a night triggers this cheerful end-of-shift chime, a sharp contrast to the game's tension and a moment every player recognises. Unlike the FNAF jumpscare scream, it signals safety rather than danger, which is why it spread through gameplay videos, streams, and meme edits. Creators still use it today because it instantly tells viewers a hard shift is over.