This sound comes from Five Nights at Freddy's 4, the 2015 horror game in Scott Cawthon's FNAF series. Players listen closely to doors and hallways, so small audio cues like this became memorable to fans. Outside the game, the clip spread through FNAF edits, animation videos, gameplay compilations and horror memes because it signals immediate danger in a fraction of a second. It is still used by creators who want a recognizable FNAF audio cue without needing a full jumpscare scream.