Dowsing Duplicates by T J Osbourne

The classic effect is as follows:

- 6 business cards are borrowed from members of the audience.
- They are stacked and torn in half, producing 12 identical halves. 
- The half-cards are mixed and laid out on the table face down.
- The mentalist impossibly finds each pair of cards, one after the other.

This is a truly impressive feat, as there is no way that the cards could be marked, or secretly peeked. 

Until you activate T.J.'s brilliant method in your mind, you really don't know where each card lies!

There are no difficult moves, nothing to be caught out on and the method works perfectly every single time.

After delving deeper into the method, We discovered that this can also be applied to a prediction effect, using a game like "Cards Against Humanity" or other similar "pairing" games. 

Even though each pair of cards is chosen at random, your prediction shows that you knew exactly what would be paired with what.

This method is something that you will carry with you for the rest of your days; as it lives only in your mind. 

After watching Alex's brilliant instruction, you will always have this secret ready to go at a moment's notice with no set up or special props required.