AT A PATIENTS HOME. JEEP WAS PARKED, APPROXIMATELY 10 MINUTES WENT BY AND ONE OF THE PEOPLE IN THE HOME STARTED YELLING MY VEHICHLE WAS ROLLING BACKWARDS. THE DRIVEWAY IS FLAT SURFACE. IT MANAGED TO TAKE OUT A FENCE AND DAMAGE THE BACK END OF MY JEEP. LUCKILY ANOTHER PERSON IN THE HOME WAS ABLE TO RUN AMD JUMP IN IT BEFORE IT HIT TREES GOING DOWN A LARGE HILL.