WHILE THE CAR WAS PARKED THE ACTIVE HEADREST DEPLOYED HITTING THE DRIVER IN THE BACK OF THE HEAD AFTER THEY GOT IN THE CAR AND WERE GETTING READY TO DRIVE OFF. THE METAL ROD REMAINED IN THE ENGAGED POSITION IN THE BRACKET BUT THE PLASTIC EDGES THAT HOLD THE METAL ROD TO THE HEADREST BROKE WHICH CAUSED IT TO DEPLOY.