MY VEHICLE WAS PARKED AND I HAD TURNED THE IGNITION OFF, REMOVED MY KEYS, AND WALKED AWAY FROM THE VEHICLE. THE VEHICLE WAS PARKED ON A FLAT SURFACE AT THE TIME OF THE INCIDENT. UPON WALKING AWAY FROM THE VEHICLE THE VEHICLE STARTED ROLLING FORWARD BY ITSELF. MY VEHICLE ROLLED INTO THE BACK OF ANOTHER VEHICLE CAUSING 4,000 DOLLARS IN DAMAGES TO THE OTHER VEHICLE. NO MAJOR DAMAGES OCCURRED TO MY VEHICLE.