WITH THE KEY IN MY POCKET--THEREFORE GEARSHIFT LEVER IN PARK POSITION--AND THE VEHICLE UNATTTENDED, IT ROLLED BACKWARDS OUT OF WHAT I THOUGHT WAS A LEVEL GARAGE, DOWN MY DRIVEWAY, ACROSS THE STREET AND DOWN MY NEIGHBOR'S DRIVEWAY. KNOCKED DOWN PART OF THE DRIVEWAY WALL AND CONTINUED ON, CRASHING INTO THE CORNER OF THE HOUSE WITH THE LEFT REAR OF THE VEHICLE.