The Pop Eyed Popper Deck is one of the most used "trick decks" of professional magicians and mentalists from all over the world. This "secret weapon" is one of the cleanest ways to force a card without sleight of hand.
One possible effect: An envelope is placed on the table with a prediction inside. The envelope is not gaffed, switched, etc. during the process of the card trick. As a matter of fact the prediction can be mailed months in advance to a spectator for a special occasion.
A deck of cards is spread across a table showing each card to be totally different. The deck can be riffle-shuffled and cut. The spectator chooses any card and turns it over. They then open the prediction and it is the EXACT card that was chosen.