A tray is displayed with three glasses attached. Inside one of the glasses is a silk handkerchief. The handkerchief is caused to jump from one glass to another when the magician holds the tray behind his back. At first the audience will think that they have caught the magician turning the apparatus around. To everyone's surprise the silk handkerchief jumps to the middle glass right before their eyes.
Very easy to do and can be done surrounded.