In 2009, Jerome Sauloup developed a trick called "Automatic Open Prediction," and fooled many magicians with it: Gaetan Bloom, Dirk Losander... After a few evolutions, he came up with a 2-deck presentation even more impossible because the spectators were doing all the work. Shawn Farquar and Eric Jones had the chance to witness this routine and were blown away.
After 10 years in development, Choice is now available! The idea is very simple. You show 2 decks, a red one and a blue one. You hand them out to 2 spectators; they will deal down as many cards as they want and stop whenever they want. Then, they exchange the cards they stopped on. When the two cards are revealed, they are the same! And as a kicker ending, all the other cards are completely blank.
This trick is dead easy to do, and the magician never touches the cards! The spectators are activating the gimmick by themselves. Includes a bonus effect with a borrowed deck of cards.