An elderly lady did her shopping and upon returning to her car, found four males in the act of leaving with her car.
She dropped her shopping bags and drew her handgun, proceeding to scream at them at the top of her voice, "I have a gun and I know how to use it!

Get out of the car you scumbags!"

The four men didn't wait for a second invitation but got out and ran.
The elderly lady, somewhat shaken, proceeded to load her shopping bags into the back of the car and get into the driver's seat.
She was so shaken she could not get her key into the ignition.
She tried and tried and then it dawned on her why.
A few minutes later she found her own car parked four or five spaces farther down.
She loaded her bags into her own car and drove to the police station.
The sergeant to whom she told the story nearly tore himself in two with laughter as he pointed to the other end of the counter, where four pale young males were reporting a car jacking by a mad elderly woman described as white, less that 5' tall, glasses, curly white hair and carrying a large handgun.

No charges were filed. :­)