An engineer was unemployed for a while. As he couldn’t find a job he decided to open up a medical clinic and put a sign outside saying: “ Get your treatment for $500, if you’re not treated get $1000 back”. A doctor walking by thought that this was a good opportunity to make some cash, so he steps inside and says that he has lost the taste in his mouth. The engineer brings a box, opens it up and put 3 drops of a liquid on the doctor’s tongue. The doctor freaks out and yells: “This is gasoline!”. To which the engineer responds: “Congratulations, you’ve got your taste back. That’ll be $500.” The doctor pays the engineer and walks out annoyed. After several days, he comes back and says that he’s lost his memory. The engineer then pulls out the same liquid and the doctor yells: “But, that is gasoline!”. The engineer congratulates the doctor as he has retained his memory and earned another $500. The doctor leaves the office, furious at this point. But after several days, he comes back yet again and says that his eyesight has become weak. The engineer says: “I don’t have any medicine for this, here is the $1000.” The doctor receives the money, but says: “Excuse me, but this is just $500.” The engineer then says: “Congratulations, you’ve got your eyesight back. That’ll be $500, please.”
