Every so often my speedometer goes wacky as if it were loose from it's bearings. It will just go flipping all over the place as if being pulled by a magnet. This only happens once or twice a year. I always drive the speed limit so it has nothing to do with driving. It's a 1995 Ford Taurus SW.
Read more: Why does my car speedometer go whackadoodle catywompis a couple of times each year?