THE EXPLORER WAS PUT INTO PARK AND LEFT RUNNING IN THE DRIVEWAY AS I WENT INTO THE HOUSE TO GET MY KIDS. WHEN I GOT OUT OF THE CAR IT DIDN'T MOVE AT ALL. WHILE I WAS GETTING MY KIDS TOGETHER I HAPPEN TO LOOK UP AND SEE MY EXPLORER CRASHED INTO A TREE IN THE BACKYARD. I WENT OUT TO SEE WHAT HAPPENED AND THE EXPLORER HAD GONE UP A SLIGHTLY INCLINED DRIVEWAY, DOWN A HILL, THROUGH AND ALUMINUM FENCE, AND CRASHED INTO A TREE. WHEN I OPENED THE DRIVER DOOR THE GEAR SHIFTER STILL SHOWED IN PARK.