An engineer opens a medical clinic (original) An engineer who was unemployed for a long time decided to open a medical clinic. 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 his clinic. Doctor: ""I have lost my sense of taste."" Engineer: ""Nurse, please bring the medicine from box 22 and put 3 drops in the patient's mouth."" Doctor: ""This is Gasoline!"" Engineer: ""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."" Engineer: ""Nurse, please bring the medicine from box 22 and put 3 drops in the patient's mouth."" Doctor: ""But that is Gasoline!"" Engineer: ""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."" Engineer: ""Well, I don't have any medicine for this. Take this $1,000,"" passing the doctor a $500 note. Doctor: ""But this is $500..."" Engineer: ""Congratulations! You've got your vision back! That will be $500.""