VEHICLE PULLED INTO PARKING LOT AT VET CLINIC AND DUE TO A MECHANICAL MALFUCTION , ACCELERETED AND STRUCK VET BUILDING. PUT VEHICHLE IN REVERSE IN AN ATTEMPT TO BACK AWAY FROM THE BUILDING, AND THE VEHICLE ACCELERATED AGAIN, TRAVLING IN REVERSE ACROSS A BUSY ROAD (THANKFULLY NO CARS WERE COMING) AND STRUCK A HOUSE WITH THE REAR OF THE VEHICLE.*AK