I WAS SLOWLY BACKING INTO A PARKING SPACE BEHIND THE OFFICE BUILDING THAT I WORK AT GOING APPROXIMATELY 4 TO 5 MPH (JUST CRAWLING). I HAVE BEEN BACKING INTO THE SAME AREA FOR OVER 15 YEARS. AS I LIGHTLY STEPPED ON THE GAS PEDAL, VEHICLE LURCHED BACKWARDS HITTING THE BUILDING SQUARELY CAUSING EXTENSIVE DAMAGE AS IT WAS A POWERFUL HIT. THIS HAD HAPPENED TWO OTHER TIMES WHEN THE CAR WAS DRIVEN BY MY HUSBAND AND PARENTS. THOSE TWO SEPARATE INCIDENTS HAD OCCURRED IN OTHER AREAS WHERE THERE WAS AMPLE ROOM TO REACT.