Doctor Predicts Longevity

Doctor: You're in good health. You'll live to be eighty.  
Patient: But, doctor, I am 80 right now.
Doctor: See, what did I tell you.

Johnny Being Johnny

A young mother paying a visit to a doctor friend and his wife made no attempt to restrain her five-year-old son, who was ransacking an adjoining room. But finally, an extra loud clatter of bottles did prompt her to say, "I hope, doctor, you don't mind Johnny being in there." "No," said the doctor calmly, "He'll be quiet when he gets to the poisons."

Blonde - Brain For Sale

A client of a hospital where they made brain transplants asked about the prices. The doctor said, "Well, this Ph.D. brain costs $10,000. This brain here belonged to a NASA top scientist and costs $15,000. And here we have a blonde's brain as well. It costs $50,000." The client asked, "What? How's that possible?" The doctor replied, "You see, it's totally unused."