I'm Not Stupid
A salesman had the bad luck to get a flat tyre on a fairly steep hill right outside the grounds of a mental hospital. He unscrewed the nuts on the wheel and jacked up the side of the car. As he did so he became aware that one of the patients was leaning on the fence watching him with great interest.
He took off the wheel and replaced it with the spare, only to discover that the five nuts had rolled down the steep gutter, and fallen into a drain. There was no way that he could get them out. While he was grappling with this problem a voice behind him said:
"Why don't you just take one nut off each of the other three wheels, and use those?" The salesman was impressed and said:
"That's pretty smart. How come you're in there?"
"I may be mad, but I'm not bloody stupid."
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