BACKING INTO DRIVEWAY THE CAR ACCELERATED TO FULL SPEED BY ITS SELF. PUSHED THE BRAKE PEDAL WITH BOTH FEET, AND THE CAR WOULD NOT SLOW. TRAVELLED ABOUT 60 FEET AND CRASHED INTO OUR DOUBLE GARAGE DOING SIGNIFICANT DAMAGE TO THE GARAGE AND THE CAR WAS A TOTAL LOSS. NOT SURE WHAT SPEED CAR ACCELERATED TO, BEST GUESS 30 MPH.