From Futility Closet:
Publicity hound Jim Moran brought a sealed case of playing cards to a meeting of magicians. One randomly chosen audience member opened the case, a second chose a deck, a third opened the deck, a fourth cut it, and a fifth chose a card.
Moran said, "It's the six of diamonds."
It wasn't. "But if it had been the six of diamonds," Moran said later, "those bastards would still be talking about it."
When I do a card trick, 99 times out of 100 I'll flub it. I should stick with the above trick and double my chances of success.
(See my interview with Futility Closet's Greg Ross.)