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 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 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 is Gasoline!"
Dr. Geezer: "Congratulations! You've got your memory back. That will be $500."
 
Dr. Young (after having lost $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." (giving him a $10 bill)
Dr.. Young: "But this is only $10!"
Dr. Geezer: "Congratulations! You got your vision back! That will be $500.