Impossible Nut and Bolt
A nut and bolt, with a small brass spacer and a beautiful metal tube are shown to the spectator. The magician then threads the nut on the bolt keeping the brass spacer in the center. This assembled bolt is placed into a brass tube, and covered with a lid. With a quick shake, the lid is removed and the contents are dumped from the tube. The Nut, Bolt and Spacer have magically unassembled themselves! All items are passed out for examination.