The jack-in-the-box is a classic children's toy in which a clown or puppet springs out of a decorated box when the lid is opened, usually after a winding music-box tune. That simple surprise has made it a lasting symbol of suspense in cartoons, horror stories and comedy, where the familiar melody signals that something unexpected is about to happen. Online, short clips of the tune and pop are widely shared on soundboards and in short-form videos, keeping the toy's playful scare alive for new audiences who recognise the sound instantly.