AUTO PARKED, FOOT ON BRAKE, MOVED GEAR SHIFT TO PARK, FOOT OFF BRAKE,CAR LURCHED FORWARD WITH GREAT VELOCITY, HIT CONCRETE WALL, RICOCHEDE OFF WALL, STARTED RUNNING BACKWARD. PUT FOOT ON EMER. BRAKE CAR STOPPED. AIRBAG DEPLOYED BUT IMPROPERLY INFLATED. CUTS AND ABRASIONS AND BRUISING ON LEFT HAND AND RIGHT.AIRBAG DID NOT DEPLOY INTO CHEST OR FACE. CALLED AAA TO HAVE TOWED/CALLED 21ST CENTURY INS. FOR NAME OF COLLISION YARD THEY WORKED WITH. TOW TRUCK ARRIVED_TOO BIG TO GET INTO PARKING LOT. DRIVER ASKED FOR MY KEYS -TOLD HIM THE CAR WITH PHYSICALLY DISABLED AFTER AIRBAG DEPLOYMENT AND COULD NOT BE DRIVEN. HE TOOK MY KEYS,STARTED THE CAR AND DROVE OFF. NOT SUPPOSED TO HAPPPEN. WENT TO EMERGENT CARE AND MY PRIMARY PHYSICIAN AND HAD CAT SCANS RUN. NEW DRIVER SEAT AIRBAGS ARE DEFECTIVE.