I WAS STOPPED IN TRAFFIC WHEN A BOX TRUCK DROVE INTO MY CAR, PUSHING IT INTO THE CAR INFRONT OF ME, OVER A CURB, AND THEN OFF THE ROAD. THERE WAS SEVERE DAMAGE TO EACH SIDE OF MY CAR; INCLUDING THE CRUMPLED BACKEND. THE DIVERS SEAT GAVE OUT AND FELL BACKWARDS SOMEHOW CAUSING THE HEADREST TO TWIST OFF LEAVING THE LEG OF IT BENT TOWARDS BY MY HEAD. THERE WAS NO AIRBAG DEPLOYMENT IN THE ACCIDENT. THE SIGNIFICANT DAMAGE TO THE CAR DEEMED IT TOTALED. HOW IS IT THAT THERE WAS SEAT, HEADREST, AND AIRBAG FAILURE?