I WAS DRIVING IN THE CENTER LANE OF A 3 LANE HIGHWAY WHEN I HEARD AN EXPLOSION AND FELT SOMETHING HIT ME AND REALIZED BY SUNROOF SHATTERED AND THE GLASS CAME DOWN ON TOP OF ME. I PULLED OVER WHEN I COULD AND COULD NOT FIND A CAUSE FOR THIS. THE ONLY THING DAMAGED WAS THE SUNROOF ITSELF. I DID NOT HAVE THE VISOR CLOSED SO IT COVERED ME IN GLASS PLUS I STILL FEEL THE IMPACT FROM EITHER THE SPRAY OR JUST THE FORCE ON MY RIGHT HEAD,EAR, AND SHOULDER. NO CUTS, JUST SORE. OUTSIDE TEMP WAS ABOUT 55-60 AND I HAD DRIVEN ABOUT 20 MILES SO THE CABIN WAS COMFORTABLE. I WAS NOT AROUND ANY TRUCKS NOR DID I DRIVE UNDER AN OVERPASS. NO EXPLANATION OTHER THAN IT EXPLODING BY ITSELF. *TR