An engineer cannot find a job, so he opens a clinic and puts up a sign outside that says, “Get treatment for $50; if not cured, get $100 back!” A doctor, seeing a good opportunity to show up the engineer and earn a quick hundred dollars, visits the clinic.
Doctor: I have lost my sense of taste.
Engineer: Nurse, bring the medicine from box 22 and place three drops in the patient’s mouth.
Doctor (spitting out the medicine): This is not medicine, it’s gasoline!
Engineer: Congrats… you have your taste back. That will be $50.
Very annoyed, the doctor returns a few days later, determined to recover his money.
Doctor: I have lost my memory; I can’t remember a thing.
Engineer: Nurse, bring the medicine from box 22 and put three drops in the patient’s mouth.
Doctor: But this medicine is for the sense of taste!
Engineer: Congratulations! Your memory is back… that will be $50.
The doctor leaves, angry. After several days he comes back 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 only a $50 note!
Engineer: Congratulations, your eyesight has improved! That will be $50.