Unknown
A man was changing a tire outside a mental institution when all the lugs fell into the gutter and were lost. As he sat wondering what to do, one of the patients who had been watching through the fence called out, “Why not take one lug from each of the other wheels, and use them until you get to town.”
“Great idea!” the man said, obviously surprised.
“Hey,” replied the patient, “I may be crazy, but I’m not stupid.”