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."
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