A man couldn't find a job anywhere, so he opened a small "miracle clinic."

Outside, he put up a big sign:
Treatment: $300. If it doesn't work, we’ll give you $1,000 back!
A local know-it-all thought: "Easy money."
He went in and said: "Doctor, I have completely lost my sense of taste."
The guy calmly said: "Nurse, bring box number 22. Three drops."
The nurse put three drops in the man's mouth.
The man immediately spat it out. "That’s gasoline!"
The doctor smiled. "Congratulations! You have regained your sense of taste. That will be $300."
The man left angry.
A week later, he returned. "Doctor, my memory is getting much worse."
The doctor said: "Nurse, box number 22. Three drops."
The man shouted: "Wait! That’s the gasoline, because of the taste!"
The doctor smiled. "Great! You’ve also regained your memory. $300, please!"
Now the man was determined to win.
He returned and said: "Doctor, I am losing my eyesight."
The doctor sighed. "Sorry. I don’t have medicine for that. Here are your $1,000."
The man looked at the bills. "There are only $500!"
The doctor smiled. "And you’ve regained your eyesight. That will be $300."