I am somewhat new to the site and hope this question is appropriate. I saw a performance that someone posted where they asked the spectator to mentally picture a deck of cards--asked them to picture red or black, the suit and then the card itself (in the presentation it was the Jack of Spades). The magician then showed the spectator that he predicted he would pick the Jack of Spades. I can't find that video now and was wondering if anyone knew who created this effect and where I can go to learn it. thank you.