An unemployed engineer could not find a job for a long time and decided to open his own clinic. He hung a sign on the building: “To cure an ailment - 100 $. If it doesn't work out, we'll give you back 200$.” A doctor passing by decided to take advantage of this and raise some money.
Hello, I don't know what happened, I have lost my taste for food, everything is the same now, tasteless.....
Nurse, please bring a pack of 22 with syrup and give it to the patient.
Okay, please open your mouth....
Ugh... it's gasoline!
Congratulations, you can taste again, that'll be 100$.
The doctor was terribly angry, but paid the bill, but returned to the clinic a few days later:
I've lost my memory, help me....
Nurse, please bring a pack of 22 with syrup and give it to the patient.
Patient, please open your mouth...
But this is gasoline again!
Congratulations, you have recovered your memory, you owe me 100$.
Even more upset, the doctor paid, but after a couple of days he decided to get even again:
Hello, I have lost my eyesight, please help me....
I am very sorry, but we are powerless here. Here is your 200$.
But there's only 100!
Congratulations, you've regain your eyesight!