Ask your volunteer to assist you. In fact, your volunteer becomes the magician.
Take any pair of scissors and then show your volunteer a rectangular strip of paper. The strip is about an inch wide and several inches long. Ask your volunteer to select exactly where the strip of paper is to be cut into two pieces.
Your volunteer can freely choose the exact place where the paper shall be cut. You don’t force anything. At the last moment your volunteer can even have a change of mind and can select a different point. The volunteer’s decision is totally free.
The strip of paper is cut at precisely the point your volunteer selects. The two pieces are then turned over to reveal a prediction printed on the other side of the strip of paper indicating exactly where the volunteer asked the cut to be made!
The prediction is always perfect and precise, and is always the one and only unique point freely selected by your volunteer.