This came from an old magician’s estate purchase. The specially prepared bridge-size Aviator cards are in like-new condition as are the two gimmicked cards and envelopes.
Effect: As the playing cards are placed face-up on the table (one at a time) the spectator can call stop at any time. The card that is stopped at proves to be the very card the magician has predicted!
You do not force the spectator to make their decision. It is a perfectly free choice. They see the cards are all different as they are placed into a pile on the table and can call stop at any point that they like. This is a real fooler!