Place this clip at the exact scare frame in your edit, then follow the reaction with the FNAF Jumpscare Scream Sound Button for a second hit, or precede it with the Danger Alarm Meme Sound Button to build false anticipation before the reveal.
About this sound
This clip is a short 1.7-second monster yell used as a jumpscare sound, a harsh distorted scream with no words. It hits as tense and startling, built to shock rather than amuse and to make a quiet moment feel unsafe. It comes from One Night at Springtrap 2, a fan game in the Five Nights at Freddy's universe.