Once a man had just picked up his car from a garage where he had had the wheels rotated. He had only gone a block or two when one of the wheels fell off. Evidently the mechanic had forgotten to put the nuts back on. Fortunately he managed to stop without a collision. While he was contemplating the situation, he heard a shout from a second-story window, and discovered that he was in front of a lunatic asylum. "Hey!" said the lunatic, "Take one nut off each of the other three wheels." "Thanks!" said the driver, and then, to be polite, "Say, you're not so crazy after all." "Sure I'm crazy" said the lunatic "but I'm not stupid."