In case (no pun intended) you missed it, this video shows a marvelous Rube Goldberg (or Heath Robinson, if you prefer) contraption contained within two suitcases. Its purpose: stamp a message on a postcard and apply the postage.
From the Vimeo description:
Conveniently built in two old suitcases, Melvin the Mini Machine is a Rube Goldberg machine specifically designed to travel the world. Each time Melvin fully completes a run, he 'signs' a postcard and sticks a stamp to it - making it ready to be sent.
[ Thanks Aaron! ]