Probably the most simple mental feat ever devised, yet incredibly deceptive!
Three cards, each with a large coloured spot on, are placed on the table. The Magician claims to have predicted one of the cards, and that is the one the spectator is going to freely choose . The spectator simply names a colour, it's a free choice, no force whatsoever, yet when the Magician's prediction is read out loud by the spectator - it's the correct chosen colour.
Very easy to perform, requires no preparation, supplied ready to work right away!