ON WEDNESDAY, 6-26-19 AT APPROX. 3:15 PM MY TRUCK WAS SITTING IN THE DRIVEWAY AND HAD BEEN PARKED THERE SINCE APPROX. NOON MONDAY. TEMP. WAS IN THE LOW 90'S WITH PARTIAL SUN. THE TRUCK WAS SITTING IN PARTIAL SHADE. I GOT INTO THE TRUCK TO RUN ERRANDS AND SHUT THE DRIVERS SIDE DOOR. I THEN HEARD A POP AND SOMETHING MOVING. I COULDN'T FIGURE OUT WHAT WAS HAPPENING SINCE I HADN'T EVEN STARTED THE ENGINE YET. I LOOKED BACKWARDS TO WHERE THE SOUND WAS COMING FROM AND THAT'S WHEN I SAW THE ENTIRE REAR WINDOW HAD EXPLODED AND WAS IN A MILLION PIECES. SHARDS WERE INSIDE THE TRUCK, ON THE CONCRETE, IN THE BED OF THE TRUCK AND IN BETWEEN THE CAB AND THE BED OF THE TRUCK. MOST OF THE SHARDS LANDED OUTSIDE THE CAB. I HAVE NO IDEA WHAT CAUSED THIS. I'VE HAD THE TRUCK SINCE IT WAS NEW. FIRST AS MY COMPANY WORK TRUCK AND THEN I PURCHASED IT AS PART OF MY RETIREMENT. THE TRUCK HAS NEVER BEEN IN AN ACCIDENT AND TO MY KNOWLEDGE THE REAR WINDOW HAS NEVER BEEN DAMAGED. THE WINDOW WAS A SOLID CAN BE HEATED. IT EXPLODED SO BAD THERE IS REALLY NO PICTURE NEEDED. ALL THAT REMAINS OF GLASS IS WHAT IS GLUED DOWN ON THE EDGES. I'M GETTING IT REPAIRED TOMORROW. LOCAL FORD DEALER SERVICE DEPARTMENT ACTED LIKE THIS WAS NOT THEIR PROBLEM; ONE SAID WE WILL FIX IT IF YOUR INSURANCE WILL PAY OF IT. ANOTHER PERSON SAID WOW, THAT'S UNUSUAL WE CAN'T HELP YOU, CALL FORD CUSTOMER SERVICE. I'VE SEEN MANY INSTANCES ON THE INTERNET OF THE VERY SAME THING HAPPENING AND ALSO WHEN THE VEHICLE IS MOVING.