An old geezer who was a retired farmer for a long time became very bored in retirement and decided to open a medical clinic. He put up a sign outside that said: "Dr. Geezer's Clinic. Get your treatment for $500, and if not cured, get back $1,000!"
Doctor Young, who was positive that this old geezer didn't know beans about medicine, thought this would be a great opportunity to get $1,000. So he visited Dr. Geezer's clinic.
Dr. Young: "Dr. Geezer, I've lost all taste in my mouth. Can you please help me?"
Dr. Geezer: "Nurse, please bring medicine from box 22 and put 3 drops in the patient's mouth."
Dr. Young: "Aaagh !! -- This is gasoline!"
Dr. Geezer: "Congratulations! You've got your taste back. That will be $500."
Dr. Young gets annoyed and goes back after a couple of days figuring to recover his money.
Dr. Young: "I've lost my memory, I can't remember anything."
Dr. Geezer: "Nurse, please bring medicine from box 22 and put 3 drops in the patient's mouth."
Dr. Young: "Oh, no you don't, that's gasoline!"
Dr. Geezer: "Congratulations! You've got your memory back! That will be $500."
Dr. Young (after losing $1000) leaves angrily and comes back after several more days.
Dr. Young: "My eyesight has become weak --- I can hardly see anything!"
Dr. Geezer: "Well, I don't have any medicine for that so here's your $1000 back," and handed him a $10 bill.
Dr. Young: "But this is only $10!"
Dr. Geezer: "Congratulations! You got your vision back! That will be $500."