VEHICLE WAS PARKED ON A DOWNHILL GRADE. ENTERED VEHICLE, POSITIONED IN DRIVER SEAT. WHEN REACHING OVER TO UNLOCK PASSENGER DOOR SOME PART OF MY BODY OR COAT CONTACTED THE PARKING BRAKE LEVER, DISENGAGING IT AND CAUSING THE VEHICLE TO ROLL DOWNHILL AND INTO A BACKHOLE, CAUSING CONSIDERABLE DAMAGE TO THE VEHICLE. *TR