The sound comes from Five Nights at Treasure Island, often shortened to FNATI, a fan made horror game inspired by Five Nights at Freddy's and set on a deserted island resort. Pato is one of its distorted cartoon attackers, and his jumpscare follows the classic FNAF jumpscare scream formula of a face filling the screen with a loud roar. Clips from FNATI spread through Let's Play videos and soundboards, where short horror stingers like this became reusable punchlines for edits far beyond the original game.