I stole this from from Car Talk, but it's still funny...
Officer Paul pulled over John for speeding. When Officer Paul asked John for his license and registration, John replied, "I don't have my license and I don't have a registration card because I stole this car." When Officer Paul asked if he had any weapons Paul said, "Yes, I have a loaded pistol in the glove compartment and a loaded rifle in the backseat." Finally Officer Paul asked if he could check the trunk. John replied, "Sure but just to warn you I have a body in the back."
Officer Paul told John to stay put. Paul went to his car to call the Chief and ask for back up. When the Chief arrived he told Officer Paul to stay in his car. The Chief went to John. When the Chief asked for his license and registration John pulled out his license and gave the Chief the registration card, both checked out and there was nothing suspicious. When the Chief asked John if he had any weapons John said “No,” and when the Chief checked the glove compartment and the back seat there was nothing. Finally the Chief asked if he could look in the trunk and John agreed. Once again, nothing.
The Chief was puzzled and John asked him why he looked so confused. The Chief said, "Officer Paul said that you stole this car, that there were two loaded guns in the car and that there was a body in the truck."
John replied, "Did he tell you that I was speeding, too?"