I'm sure you've seen some variation on The Most Useless Machine? Perhaps your read about the kit I posted about here on The Automata Blog or maybe you saw my own take on the gadget. Mine uses a miniature trunk in place of the generic box and a hand-carved fist punches the button closed.
The version shown here is in danger of NOT being useless because it is so highly inventive and entertaining. I won't bother to try to describe all that it does, but rest assured, it does more than just turn itself off!