CONSMUER PUT THE JEEP IN PARK AND GOT OUT TO PUT SOMETHING IN THE BACK HATCH LEAVING THE DRIVERS' DOOR OPEN. JEEP POPPED OUT OF GEAR GOING IN REVERSE AT A VERY HIGH SPEED. CONSUMER WAS KNOCKED DOWN BY DOOR AND FRONT WHEEL RAN OVER CONSUMERS' FOOT AND PART OF LEG. JEEP CONTINUED TO ROLL IN REVERSE UNTIL IT SMASHED INTO A BUILDING.