Boxy Boo is a jack-in-the-box toy monster from the Poppy Playtime universe, best known in Project: Playtime, the asymmetric multiplayer horror game where players survive toy monsters while completing puzzles. His jumpscare became a favourite clip for horror fans because it combines a familiar toy design with a sudden, aggressive lunge. Remade versions like this one circulate on soundboards and in fan edits, keeping the scare usable even for creators who do not own the game, and it remains popular for pranks, reaction videos and Halloween content.