A man who was unemployed for a long time decided to open a medical clinic, despite the fact that he was not a doctor. He puts a sign outside the clinic: “A cure for your ailment guaranteed at $500; we’ll pay you $1,000 if we fail.”

A Doctor thinks this is a good opportunity to earn $1,000 and goes to this clinic.

Doctor: “I have lost my sense of taste.”

Man: “Nurse, please bring the medicine from box 22 and put 3 drops in the patient’s mouth.”

The nurse returns with the medicine and places the 3 drops in the Doctor’s mouth. He spits it out and replies, “This is Gasoline!”

Man: “Congratulations! You’ve got your taste back. That will be $500.”

The Doctor gets annoyed and goes back after a couple of days later to recover his money.

Doctor: “I have lost my memory, I cannot remember anything.”

Man: “Nurse, please bring the medicine from box 22 and put 3 drops in the patient’s mouth.”

Doctor: “But that is Gasoline!”

Man: “Congratulations! You’ve got your memory back. That will be $500.”

The Doctor leaves angrily and comes back after several days, more determined than ever to make his money back.

Doctor: “My eyesight has become weak.”

Man: “Nurse, please bring the medicine from box 11 and put 3 drops in the patient’s eyes.”

The nurse walks in carrying box #22.

Doctor: “Wait, that’s the box with the gasoline in it!”

Man: “Congratulations! You’ve got your vision back! That will be $500.”