A jack-in-the-box is a children's toy that outwardly consists of a box with a crank.[1] When the crank is turned, it plays a melody, often "Pop Goes the Weasel". At the end of the tune there is a "surprise":[2] the lid pops open and a figure, usually a clown or jester, pops out of the box. Some jack-in-the-boxes open at random times when cranked, making the startle even more effective. Many which use "Pop Goes the Weasel" open at the point in the melody where the word "pop" would be if it were sung.