Often when performing card magic, it is important to make a spectator audience member believe that they have chosen a card by free choice when in fact you have forced a card upon them.
There are various ways of forcing cards and here is a simple one:
The Double Turn Force
To perform this particular force, you need to know which card is on top of the pack. For the purposes of explanation, they say that the top card is the three of clubs.
First of all give the cards a false shuffle retaining the three of clubs on top of the pack then hold up the deck to a spectator and asked them to take a few cards of the top, turn them face up and put them back on top of the pack.
Next ask another spectator to take a slightly larger stack of cards from the top of the deck, turn them face up and then replace them on top of the pack.
Your pack of cards is now stacked in such a way that the top part is face up and the bottom part face down.
Next you fan through the cards until you have all of the face up cards
in your right-hand and you offer your spectator the first face down card
that comes into view.
It appears to your audience that a card has been freely selected but you know that the card selected is the three of clubs.