I never had a jack-in-the-box as a kid, but I remember my cousin having one and it scared the crap out of me. You would crank the handle to a somewhat creepy rendition of Pop Goes The Weasel, at least for the first three measures. Then it was almost time for the "Pop", and the timing was always just a little off. Sometimes it was a full crank, sometimes 3/4, sometimes 1 1/2. I don't know if it was intentional, but it sure caused a lot of child anguish and stress. Then the damn clown would pop out and it was time to change your shorts. This version by ~Likus~ doesn't "pop" up, but the crank does make the clown go up and down, which is *almost* as creepy.

Jack the Master of Mischief