The Brain Surgeon was about to perform a brain

 transplant. You have your choice of two brains, he told the

 patien. For $1000 you can have the brain of a psychologist, or

 for $10,000 you can have the brain of a politician.

The patient was amazed at the huge difference in price. Is

 the brain of a politician that much better? he asked.

The Brain Surgeon replied, No, it’s not better, just unused.