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 visits the clinic.
Doctor: “I have lost my sense of taste.”
Engineer: “Nurse, bring the medicine from box no 22 and place 3 drops in the patient's mouth.”
Patient (doctor): Spits out the medicine and says, "This is not medicine, its petrol".
Engineer: “Congrats... You have your taste back ... that will be $50”
Doctor gets annoyed, and returns after several days to recover his money.
Doctor: “I have lost my memory and can't remember a thing.”
Engineer: “Nurse, bring medicine from box no 22 and put 3 drops in the patient's mouth.”
Doctor: "This medicine is for the sense of taste," protests the doctor.
Engineer: “Congrats. Your memory is back... that will be $50.”
Doctor leaves, but after several days angrily returns for one last try.
Doctor: “My eyesight has become weak.”
Engineer: “Well I don't have any medicine for that. Take this $100.”
Doctor: “But this is $50 note.”
Engineer: “Congratulations, your eyesight is better... that will be $50”