Try not to sell a stolen car to a policemen?

"Car Phone
A woman was reporting her car as stolen, and mentioned
that there was a car phone in it. The policeman taking
the report called the phone and told the guy that answered
that he had read the ad in the newspaper and wanted to buy
the car. They arranged to meet, and the thief was arrested."
http://www.digitaldreamdoor.com/pages/quotes/funny_news.html