VEHICLE WAS IDLING IN DRIVEWAY. STRAPPED CHILD IN CARSEAT , GOT IN, PUT OUR SEAT BELTS ON, PUT FOOT ON BRAKE AND CAR FROM PARK TO REVERSE. CAR ACCELERATED AT HIGH RATE OF SPEED FORWARD WITH FOOT ON BRAKE THE WHOLE TIME. FOOT NEVER TOUCHED THE GAS. CAR RAN INTO A ROCK WALL CONTINUING TO ACCELERATE, WENT UP THE WALL AND ALMOST ROLLED COMMING TO REST HALF ON HALF OFF THE WALL.*AK