From the ArcaMax Publishing, Jokes Newsletter:
http://www.arcamax.com/news/jokes/s-367486-242621
This Policeman pulled a car over and told the man driving that he was
going 50 mph in a 40 mph zone.
"I was only going 40!" the driver protested.
"Not according to my radar," the officer replied.
"Yes, I was!" the man shouted back.
"No you weren't!" the policeman said, starting to get annoyed. With
that, the man's wife leaned toward the window and said,
"Officer, I should warn you not to argue with my husband when he's
been drinking."