Not quite a joke, but... My friends were bored, so they were cruising around in their car - hoon-mobile commodore. They followed a cop for about 15 minutes. As there was 3 of them in the car, the cops stopped the car and said "Are you related?....Do you understand the rules of a Red P Plate?". My mate then said "um... this is a green p plate". The cop turns around and walks back to his car and drives off.