Specialist vs. General Practitioner

What's the difference between a general practitioner and a specialist?
One treats what you have, the other thinks you have what he treats.
 

Sheep Heart

A man needing a heart transplant is told by his doctor that the only heart available is that of a sheep. The man finally agrees and the doctor transplants the sheep heart into the man. A few days after the operation, the man comes in for a checkup. The doctor asks him "How are you feeling?" The man replies "Not BAAAAD!"

Doctors Promise

"The doctor said he would have me on my feet in two weeks."
"Was he successful?"
"Yup, I had to sell my car to pay his bill."