IN A PARKING SPACE, FOOT ON BRAKE, MOVING GEARSHIFT TO PARK, ENGINE REVVED AND CAR LUNGED FORWARD WITH CAR IN PARK AND MY FOOT ON THE BRAKE. IT JUMPED THE CONCRETE BUMPER, RAN OVER HANDICAP PARKING SIGN AND HIT CAR IN ADJACENT PARKING SPACE HARD ENOUGH TO MOVE IT BACK INTO THE DRIVING LANE OF PARKING LOT. AT THAT POINT THE CAR STOPPED. WE PULLED IT BACK INTO PARKING SPACE TO HELP MOVE OTHER HIT CAR OUT OF TRAFFIC