WHILE DRIVING ON THE HIGHWAY DURING RUSH HOUR THE SUNROOF SPONTANESOUSLY SHATTERED. THE SUNROOF WAS CLOSED AND THE CLOTH SHIELD WAS TUCKED AWAY. IT SOUNDED LIKE A GUNSHOT AND DEAFENED MY EARS FOR ABOUT 5 MINUTES. I THOUGHT SOMEONE FIRED A GUN OR A NEARBY CAR GOT INTO AN ACCIDENT SINCE I FELT NO IMPACT OTHER THAN SOUND. BECAUSE I WAS DRIVING I WAS EXTREMELY STARTLED WHEN I LOOKED UP AND SAW AN OPEN WINDOW AND GLASS HAD FALLEN ALL OVER ME. IT HAD HAPPENED SO QUICKLY. I TRIED TO PULL OVER IN THE NEAREST EXIT AND WHILE GETTING OUT OF THE CAR AND MANEUVERING OUT, HAD CUT MYSELF SEVERAL TIMES.