I love jokes :)

A man went to his lawyer and told him, "My neighbor owes me $500 and he won’t pay up. What should I do?" 
"Do you have any proof he owes you the money?" asked the lawyer. 
"Nope," replied the man. 
"OK, then write him a letter asking him for the $5,000 he owed you," said the lawyer. "But it's only $500," replied the man. "Precisely. That’s what he will reply and then you’ll have your proof!"