PULLED INTO PARKING SPOT. PUT TRUCK IN PARK. LEFT VEHICLE AND WENT INTO STORE. TRUCK ROLLED BACKWARD AND CRASHED INTO ANOTHER VEHICLE. WHEN WE LOOKED IN THE TRUCK, IT WAS STILL IN PARK. TOOK TO FORD AND THEY INSPECTED IT AND SAID EVERYTHING WAS FINE AND THAT THE PIN WAS WORKING. A FRIEND HAD SAME THING HAPPEN. I BELIEVE THERE IS A PROBLEM WITH THE TRUCK AND HAD THEY INSPECTED IT ON THE SPOT, THEY MAY HAVE DISCOVERED A PROBLEM. SINCE WE DROVE TRUCK AFTER ACCIDENT, IT PROBABLY LOOKED FINE WHEN THEY INSPECTED IT. THERE HAVE BEEN SIMILAR PROBLEMS WITH F-150 BUT MINE WAS NOT PART OF A RECALL.