SHORTLY AFTER I TURNED RIGHT, WHILE LEAVING A PARKING LOT AT LOW SPEED, OUT OF THE BLUE I WAS FORCEFULLY HIT IN THE BACK OF MY HEAD. I PULLED OVER IN CONFUSION TO ASSESS WHAT HAD HAPPENED. THERE WERE NO FLYING OBJECTS IN THE CAR, NOR OTHER CARS BEHIND ME, AS I BRIEFLY WONDERED IF I HAD BEEN REAR-ENDED. UPON LEAVING MY VEHICLE, I IMMEDIATELY SAW THAT THE HEADREST WAS SPLIT OPEN, AND WAS THE CAUSE OF THE HARD SMACK ON THE HEAD.