One of these days, a guy is going to show you a brand-new deck of cards on which the seal is not yet broken. Then this guy is going to offer to bet you that he can make the jack of spades jump out of this brand-new deck of cards and squirt cider in your ear. But, son, you do not accept this bet because, as sure as you stand there, you're going to wind up with an ear full of cider. So said Sky Masterson, gambler and philosopher, in Guys and Dolls. Brother Sky was a skeptic. He believed...