I heard this today on an AA speaker tape, and thought I'd share it:
A doctor discovered how to transplant the human brain successfully, and one of his patients, an elderly man, was asking about a possible transplant. So the doctor showed him the brain of a lawyer, and said, "That's $20,000, and this brain from a doctor is $50,000 - oh, and I've got one over here from an alcoholic, and that one is $100,000."
The old man was confused, and asked the doctor, "The lawyer's brain is $20,000, and the doctor's brain is $50,000, but you're charging $100,000 for an alcoholic's brain?"
The doctor replied, "Well, of course, the one from the alcoholic has never been used!"