Step by step

  1. This trick requires simple set up - alternating red and blue cards - you can use as many cards as you want
  2. This trick is best to be presented to two spectators so simply ask each one of them one by one if he wants to keep a card or get rid of it
  3. If he wants to keep it, then place the card to his pile, if he says he wants to get rid of it, then place it into separate pile
  4. Now tell him that back color of each card was random and reveal that there is mix of colors in the pile with rejected cards and that spectators managed to select just cards with same back color!