A man went in for a brain transplant operation and was offered a choice of two brains by the surgeon.

He could choose either a teacher's brain which would cost him $10,000 or a politician's which would cost $100,000.

"Does that mean that the politician's brain is much better than the teachers's?" asked the clearly puzzled man.

"No, not exactly." replied the surgeon, "The politician's has never been used so it's almost like new."