my 1995 F-150 just now did it...I was sitting in the truck with the door open, looking for something in the supercab part...alarm went off. The remote entry fob was in the house, not even in my pocket. I went inside to get it, pushed the "panic" button and still going off(actually got louder) . I punched the "lock" button on the fob and it quit. Maybe having the door open triggers it somehow? That's why I googled this and ended up on here...