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."

Mr "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.
Mr 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."
Mr Young: " Aaagh !! this is petrol!

Dr. Geezer: "Congratulations! You've got your taste back. That will be $500."

Mr Young gets annoyed and goes back after a couple of days figuring to recover his money.
Mr 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."
Mr Young: "Oh, no you don't, that is petrol!

Dr. Geezer: "Congratulations! You've got your memory back.
That will be $500.

Mr Young (after having lost $1000) leaves angrily and comes back after several more days.
Mr 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)
Mr Young: "But this is only $10!

Dr. Geezer: "Congratulations! You got your vision back! ; that will be $500.

Moral of story -- Just because you're "Young" doesn't mean that you can outsmart an "old Geezer".
Remember: Don't make old people mad. We don't like being old in the first place, so it doesn't take much to piss us off.