Boing magic box

When I was a kid I had a funny toy I've never seen again. It has been around my head for ages and now is the time to give it a chance and make it for my nephew. It had a sucker on its bottom and a spring attached to the sucker. When you stick the sucker on a table it holds the spring some time, but in the end after some seconds the sucker unsticks and the spring make the whole thing jump!! It was very funny but, what if you could make jump anything you want? I designed this box that holds inside