It's could be caused by living too close to Boulder (the land of fruits and nuts.) Or maybe you put some water from Rocky Flats in the radiator. Either way you're screwed and have no one to blame but the government.
(dented the rear bumper of my '92 in '92 by backing into the light pole in Laddy's parking lot - 59th and Ralston) (and it was all their fault too)