Sprunki is a fan-made mod of the music game Incredibox that spread through browser game sites, YouTube playthroughs and short-form edits. Players build a loop by assigning sounds to cartoon performers, and placing a black hat unlocks the hidden horror mode, where designs, backgrounds and loops turn dark. Clukr, the silver character with a cymbal on his head, keeps his rhythmic role in this mode but sounds harsher and more broken. Fans isolate that clank like a FNAF Jumpscare Scream moment, reusing it to mark the shift from playful mix to nightmare version in fan animations and remixes.