Witchcraft

You show four cards and explain that they are copies of the execution warrants for four witches from the late 1600s. The judges long suspected that as well as being witches they were all part of a secret group who had made a pact with Satan, but they were never able to prove this.. not even with torture.
You show that each card bears the details of a witch along with some facts and figures about them.

* The number of the death warrant
* Their age
* The number of birthmarks they have (marks of the Devil)
* The number of days their body was to remain on display.
 
You also show an envelope in which you say is a prediction that will prove, without doubt, that these witches were working for the Devil.

Hand the cards out to four spectators saying that you believe within the numbers is the hidden proof of this Devil worship. Each person is asked to give you a number from their card. When these four freely selected numbers are added together the total is found to be the Devil's own number, and matches exactly the prediction in the envelope.

This effect is completely self working, the special cards do all the work. This pocket size mentalism effect will fit in your wallet so that you are ready to perform anytime, anywhere.