A guy has his tires rotated and the garage forgot to tighten the bolts on one of the tires. They all fell off, and the tire is about to come off.

He stops in front of the State mental institution and looks at the tire wondering what to do.

A patient at the institution who is watching his delima finally says:

"Why don't you take one bolt off of each remaining tire and put it on that one until you can get to a garage?:

"Good Idea!" So he does that. Then he asks the patient why he is confined to a mental institution with his brains and common sense.

The guy says: "I'm here because I'm crazy, not because I'm stupid."