An Engineer could not find a job, so he opens a clinic and puts a sign outside that says “Get Treatment for $50. If not cured get back $100”.

A doctor thinks this is a good opportunity to show up the engineer and earn a quick $100. He goes to the clinic and says, “I have lost my sense of taste.”

The engineer tells his nurse, “Bring the medicine from Box No. 22 and place 3 drops in the patient’s mouth.”

The patient (who is the doctor) spits out the medicine and says, “This is not medicine… it’s gasoline.”

The engineer says, “Congratulation! You have your taste back. That will be $50.”

Doctor gets annoyed… and returns after several days to recover his money. He tells the engineer, “Sir, I have lost my memory and can’t remember a thing.”

Engineer tells the nurse to bring medicine from Box No 22 and put 3 drops in patient’s mouth.”

Doctor protested, “Wait just a minute! That medicine is for the sense of taste.”

Engineer responded, “Congratulation, sir. Your memory is back. That will be $50.”

Doctor leaves, but after several days, he angrily returns for one last try. Doctor says, “OK… my eyesight has become very weak.”

Engineer says, “Well I don’t have any medicine for that. Take this $100.”

Doctor looks at the money… and says, “Wait a minute! This is only a $50 bill.”

Engineer says, “Well, congratulations to you, sir. Your eyesight has gotten better. That will be $50.”