The sound comes from Five Nights at Freddy's, the indie horror game released in 2014, where players survive nights in a haunted pizzeria while animatronic characters hunt them down. When one reaches the office, the game cuts to a close-up jumpscare accompanied by this loud screech. Early YouTube playthroughs and reaction videos made that moment famous, and clips of it spread across meme pages and short-form video. It remains popular because it instantly signals a horror scare, even to viewers who have never played the game.