THE HEADREST OF MY SEAT POPPED OUT WHILE DRIVING AND FORCEFULLY HIT THE BACK OF MY HEAD. THE OCCURRENCE WAS RANDOM AND HAPPENED DANGEROUSLY WHILE DRIVING ON A CITY STREET. LUCKILY I WASN'T SEVERELY HARMED IN THE PROCESS HOWEVER I DO IMAGINE THAT A DRIVER CAN POTENTIALLY BE HARMED SEVERELY WITHIN THIS OCCURRENCE. I FELT AS IF I WAS PUNCHED IN THE BACK OF MY HEAD WITH BRUTE FORCE