Sorting cards by color is easy right? What if the cards are face down? Hand this challenge off to your friends and watch their amazement when they reveal the cards to be correctly sorted. The magic may be out of your hands but it is definitely... OUT OF THIS WORLD
Any deck of playing cards can be used to perform this effect.
Printed instruction guide for step by step learning
This effect is credit to: Paul Curry in 1942; The Trick That Fooled Winston Churchill