I WAS DRIVING DOWN A RESIDENTIAL STREET AT 35MPH AND HEARD WHAT SOUNDED LIKE A LOUD EXPLOSION. I LITERALLY THOUGHT A GUN SHOT HAD BEEN FIRED TOWARDS ME AND HIT MY VEHICLE. I TRIED LOOKING AROUND AND NOTHING SEEMED TO BE SHATTERED UNTIL I SAW MY ARM BLEEDING SLIGHTLY. AND SMALL SHARDS OF GLASS ON THE SEAT. I PULLED THE CAR OVER TO THE SIDE OF THE ROAD AND THE SUN ROOF WAS COMPLETELY SHATTERED. I AM ABLE TO TELL THAT THERE WAS NO IMPACT FROM A ROCK OR ANYTHING AS THE GLASS IS BLOWN OUTWARDS AND NOT INWARD. I AM NOT SURE HOW THE GLASS 'BLEW UP' OR SHATTERED IF NOT FROM ANY IMPACT BUT THIS IS VERY CONCERNING AS I DO HAVE SMALL CUTS ON MY ARM FROM THE GLASS COMING THROUGH.