LEFT THE JEEP IDLING IN PARK AND REALIZED AFTER I HAD BEEN OUT OF THE JEEP FOR A MINUTE OR SO THAT IT WAS DRIVING IN REVERSE. RAN AFTER IT AND OPENED THE DOOR TO STEP IN ON THE BRAKES AND WAS KNOCKED DOWN BY THE DOOR. I CONTINUED TO RUN AFTER IT. RESULTING IN SMASHING INTO A METAL PAINTING DEVICE.