The spectator freely chooses a card from a packet of 6 Bicycle® playing cards.  When the magicain turns the cards face up, we see that all the cards are the same - except for the one the spectator chose. 

As a double-whammy, the magician opens a small envelope that has been in plain view the whole time.  Inside, is a card predicting the specator's choice.
There's no force here - the audience member has a truly free choice of cards - yet they will always select the only one.  that doesn't match the rest of the packet.  And the magician's prediction will always be right.

Easy to perform and comes with step-by-step video tutorial instructions. A Trap Door Magic® exclusive.