This sound comes from Leopold.EXE, the jumpscare character in Five Nights at the AGK Studio 6: The Lockdown Part 1, a fan-made horror game inspired by Five Nights at Freddy's. Like other entries in the Five Nights at the AGK Studio series, it uses sudden, loud jumpscares as its main scare, and clips of those moments were shared on soundboards and in fan videos. As a short FNAF jumpscare scream, it is now reused well beyond the original game, mainly by creators making horror edits, reaction clips and parodies who need an instant, recognisable shock.