EFFECT: You display a copper penny and steel nail, which can be handed out for inspection. Ask a spectator to open both of their hands palm up. You place the copper penny in one hand and the steel nail in the other, having them close their hands. You then question the spectator if they felt the magic take place. Your audience and the spectator both believe you mean that the penny and nail have changed places. You tell the spectator to open their hands and watch the shock as they see the penny is now steel and the nail is now copper!