WAS PULLING INTO MY PARKING SPOT AT WORK (SLOWING DOWN, STEPPING ON BRAKE) WHEN CAR SUDDENLY ACCELERATED TO WIDE OPEN THROTTLE. I PRESSED HARD ON THE ON BRAKE, IT WOULD NOT STOP. IT WAS BUCKING LIKE A BRONCO. IT WENT OVER THE CURB, ACROSS THE SIDEWALK. BY THEN I WAS STANDING ON THE BRAKE WITH BOTH FEET. IT TOOK OUT A 3-FT. TALL LIGHT ON THE LAWN BEFORE I THREW IT INTO NEUTRAL AND STOPPED IT.