APPLIED BRAKES TO STOP VEHICLE, PUT TRANSMISSION INTO PARK, TURNED KEY OFF, REMOVED KEY, OPENED DRIVER DOOR, TOOK FOOT OF BRAKE PEDAL, EXITED VEHICLE,STARTED TO WALK BEHIND VEHICLE, NOTICED VEHICLE DRIFTING TOWARDS ME, OPENED DRIVER DOOR, ATTEMPTED TO JUMP IN TO APPLY BRAKES, TUMBLED HALFWAY OUT OF VEHICLE (STRAINED NECK AND KNEE), PULLED MYSELF IN BY THE STEERING WHEEL, APPLIED BRAKE AS VEHICLE HIT PARKED PICKUP TRUCK, STARTED VEHICLE, MOVED BACK INTO PREVIOUS PARKING SPACE, APPLIED BRAKES, PUT TRANSMISSION INTO PARK, TURNED OFF KEY, TOOK FOOT OF BRAKE PEDAL, VEHICLE STARTED TO DRIFT (AGAIN), APPLIED FOOT BRAKE AND EMERGENCY BRAKE, VEHICLE STOPPED.