A man was driving an automobile

and a wheel fell off next to a mental institute. He pull the wheel from the ditch and brought it back to automobile, but, he could not find the 4 lug nuts that held the wheel on. While he was scratching his head a patient behind the fence said “Why don’t you take one lug nut from each of the other three wheels to put the forth wheel on?” The man said “That’s brilliant! Why in the world are you locked up in there?” The patient responded “I’m crazy NOT stupid.”