Hahahahahaha! I just remembered this! I found this on a joke site months ago! It's supposedly a true story too! Here's the link to the main page of their jokes: www.joek/jokes/index.shtml

True story from San Francisco

A motorist was unknowingly caught in an automated speed trap that measured his speed using radar and photographed his car. He later received in the mail a ticket for $40, and a photo of his car. Instead of payment, he sent the police department a photograph of $40. Several days later, he received a letter from the police department that contained another picture—of handcuffs.