Crystal Cleaver by Tenyo Magic
"This has to be one of my favorite Tenyo Magic tricks EVER! The method is so freggin' smart and is a real fooler even for your magician friends if they've never seen it before. A must have for your magic collection!" -Luke Dancy
A ring (which may be borrowed) is placed into a crystal casket and the top is closed. The box is covered with an empty tube. A magical cleaver (a small sword) is inserted into the top of the tube, and then magically pushed down through the crystal casket and through the ring. When the tube is removed, the sword is through the ring inside the casket.