The web page asked you to choose a card out of a set of cards and then to click on a link. That link took you to a page with a new set of cards. The page stated that the card you picked was now missing from the set, because the site had read your mind and knew which card to remove. The way the trick worked was that none of the cards in the first set were in the second set -- the second set contained similar cards to the first set, but none of the same ones. Many people first think that the web page somehow determined what card they had chosen even though they had done nothing on the computer to indicate any particular card.
A while after sending the link to my mom, I sent her an explanation for how the trick worked. She sent back email saying that she and her husband were rolling on the floor with laughter because they had spent the last half hour trying to fool the computer using various methods. One of them was this: her husband would go into another room in the house. Then my mom would call him on his cell phone using hers and tell him all the cards. Then he'd tell her that he'd chosen one -- but not tell her which one -- and then she would click on the link. They were frustrated and befuddled that the computer still "knew" which card to remove even though they had gone to great lengths to separate the person that chose the card from the computer."
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