The magicians guide to peaking in pockets
This is what the trick will look like to your soon blown away group of happy spectators. You produce a normal, everyday deck of cards, and calmly explain that you have powerful X-ray vision. You hold the deck of cards out, so they can see the bottom card, and you can't. You prove the amazing strength of your X-ray vision by staring through the deck and reading the card on the bottom.