Grunkfuss is a clown character from One Night at Flumpty's, a fan-made horror game inspired by Five Nights at Freddy's, where he appears as one of the night's threats. His jumpscare, like the classic FNAF jumpscare scream, became a staple of horror game soundboards as players clipped the moment for edits, reaction videos and memes. Because the sound is short, loud and instantly recognisable to fans of the series, creators still reuse it to signal a sudden scare without needing any context from the original game.