ON FEB. 3RD, I WAS PULLING INTO A PARKING SPACE IN FRONT OF A STORE WHEN MY S60 R TYPE VOLVO BEGAN TO ACCELERATE ON ITS OWN AND REACHED VERY HIGH RPM. MY FOOT WAS NOT EVEN ON THE ACCELERATOR AS THE CAR NORMALLY IDLES FAST ENOUGH TO PERFORM PARKING MANEUVERS. I HIT THE BRAKE BUT THE CAR CONTINUED TO MOVE. IT JUMPED THE SIDEWALK; HIT THE BUILDING AND PROCEEDED TO DIG A HOLE IN THE FLOWERBED AT THE STORE'S FRONT. THIS ALL HAPPENED IN THE LENGTH OF A PARKING SPACE. I CAN'T REMEMBER WHETHER I SHUT THE IGNITION OFF OR OF THE ENGINE STOPPED ON ITS OWN SHORTLY AFTER THE COLLISION. NEITHER THE AIRBAGS NOR THE PEDESTRIAN AVOIDANCE BRAKING SYSTEM DEPLOYED. I HIT THE BUILDING SO HARD THAT THE BRICK CRACKED INSIDE AND OUT OF THE STRUCTURE. THE DOOR IS STILL INOPERABLE.