A motorist had a flat tire in front of an insane asylum. He took the wheel off, but when he stood up he tipped over the hubcap containing the bolts, spilling them all down a sewer drain.

A patient, looking through the fence, suggested that the man take one bolt from the remaining three wheels to hold the fourth wheel in place until he could get to a service station.

The motorist thanked his profusely and said, "I don't know why you are in that place."

The patient said, "I'm here for being crazy, not for being stupid."