Effect

The Magician shuffles a deck of cards and asks the spectator to pick a card. He shuffles the deck some more and asks the spectator to pick a second card. The spectator signs both cards. The Magician then cuts the deck and has the spectator place the two signed cards inside of the deck. The Magician shuffles the deck once again.
 
The spectator is given a bag and asked to hold it open. The Magician starts dropping groups of cards from the deck into the bag. Once the entire deck has been placed in the bag, the spectator closes the bag and shakes it around, shuffling the cards even more.
 
The Magician asks someone to blindfold him and make sure that he cannot see beyond the blindfold. He then reaches into the bag and miraculously finds the two signed cards instantly. He removes the cards from the bag and shows them to the spectators, explaining that he was able to locate the signed cards so quickly due to his extra keen sense of touch!

Comes complete with necessary gaffs and detailed instructions on how to perform this truly amazing trick!