An old geezer became very bored in retirement and decided to open a medical clinic. He put a sign up outside that said: "Dr. Geezer's clinic. Get your treatment for £500. 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 went to Dr. Geezer's clinic.
Dr. Young: "Dr. Geezer, I have 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 Dr. Young's mouth."
Dr. Young: "Aaagh !! -- This is petrol!"
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 have lost my memory, I cannot 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 petrol!"
Dr. Geezer: "Congratulations! You've got your memory back. That will be £500."
Dr. Young, having lost £1000, leaves angrily but comes back after several more days.
Dr. Young: "My eyesight has become weak. -- I can hardly see anything!"
Dr. Geezer: "Well, I'm sorry, but I don't have any medicine for that so,
here's your £1000 back." and handed Dr. Young a £10 note.
Dr. Young: "But this is only £10!"
Dr. Geezer: "Congratulations! You got your vision back!. That will be £500."