(Effect) Magician shows two papers, one is a paper that arrow shape has been cut out, and the other is black rectangular paper. Now he passes the black paper through yellow paper to show there is a back arrow pointing down… Next magician asks the spectator to hold both ends of the black paper… which means there is NO way to remove or turn over yellow paper, so it’s impossible to have the arrow point UP…. However… Even though it’s in impossible situation, the magician magically have the arrow point UP! Everything can be handed out to spectator for examination, without switching out.