Well, guess I'll just mention that the Jack in the Box restaurant got its name (and CEO) from the toy of the same name. Can't think of anybody who hasn't owned one, but just in case, here's the description: A Jack in the Box is a little colorful box with a spring loaded lid (closed) and a little crank on the side. Twisting the crank will play a song (usually, "Pop Goes the Weasel"), and at a certain point (usually at "pop"), the lid opens and a little person named Jack (usually a clown) pops out. Push Jack back in, close the lid and repeat.

Whenever I think of the toy, I think of The Neverhood (get the demo so you can see this bit, it's pretty funny).