An elderly lady finished her shopping and, upon return to the parking lot, found four men in her car. She dropped her shopping bags and drew her handgun, screaming at the top of her voice that she knew how to use it and that she would if required, so they should get out of the car. The four men didn't wait around for a second invitation, but got out and ran like mad, whereupon the lady loaded her shopping bags into the back of the car and got into the driver's seat.
Small problem -- her key wouldn't fit the ignition. Her car, identical to the one she was in, was parked four or five spaces farther down. She loaded her bags into her own car and drove to the police station.
The officer to whom she told the story nearly tore himself in two with laughter and pointed to the far end of the counter, where four men were reporting a carjacking by a mad elderly woman.
No charges were filed.