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!"