Bits and Pieces, July, 1991
Once, when a stubborn disputer seemed unconvinced, Lincoln said, "Well, let's see how many legs has a cow?" "Four, of course," came the reply disgustedly. "That's right," agreed Lincoln. "Now suppose you call the cow's tail a leg; how many legs would the cow have?" "Why, five, of course," was the confident reply. "Now, that's where you're wrong," said Lincoln. "Calling a cow's tail a leg doesn't make it a leg."