Riddle: A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50."
The boy looked around and saw no scale so he agrees; thinking no matter what the man writes he'll just say he weighs more or less.
In the end the boy ended up paying the man $50. How did the man win the bet?
Answer: The man did exactly as he said he would and wrote "your exact weight" on the paper.