PLACED CAR IN PARK WITH DRIVERS DOOR OPEN AND KEY IN IGNITION (TURNED OFF). CAR SLIPT INTO REVERSE AND ROLLED BACKWARD. TRIED TO STOP CAR FROM ROLLING AND GOT PINNED BETWEEN CAR DOOR AND FRAME OF GARAGE DOOR. CAR DOOR BENT BACKWARD AND WAS SEVERELY DAMAGED. GARAGE DOOR FRAME BENT FROM WEIGHT OF CAR. OWNERS LOWER BACK WAS INJURED FROM BEING PRESSED BETWEEN CAR DOOR AND FRAME. *TR