Hit something or slid totally sideways and then had the tires bite in gravel or something. This will roll any car at speed when sliding sideways. Was it in bad weather? The back end is light and if it hydroplanes??? One good reason for keeping good tread on the tires, not just the legal limit. My wifes festiva had just legal tires on it back many years ago when I bought it for her for christmas of 93, The car had 60,000 on it but was only 18 months old (someone had used it to commute 200 miles a day). The car was like brand new except for the tires and we took it on a trip to myrtle beach and hit a rain storm on I26 on the way home. It was like driving on ice or slick mud, scared the heck out of me. I kept driving slower, even at 45 the car kept slipping around. Had to drive 40 to keep control. I was upset and told the wife that if that could not be fixed then we were getting rid of the car. Put on new tires and the difference was night and day. I could take it up ovr 80 in the rain and it stuck to the road well. Then she was a keeper. Has 208,000 on it now and still gets 40 with my wife running around town (a/c running and all) and around 50 on a trip if you keep it under 65mph. I love that car, but the reason I mention it is the weights of a festiva and a spridget are almost exactly the same so keep good rubber on these light cars.