A man went to his lawyer and told him,

“My neighbour owes me £500 and he won’t pay up. What should I do?”

“Do you have any proof that 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!”