This man went to the doctor and in his office he had three brains in jars. The man said what are those and the doctor replied, "We can take out your brain and give you a new one". The man asked how much does it cost and the doctor replied, "The first one cost 100,000 it belonged to a doctor, the second one cost 300,000 it belonged to a professor, and the last one belonged to a hillbilly". The man replied well that one should be cheap and the doctor said, "No its 500,000 dollars". Why so much asked the man, "Because it was never used", replied the doctor.