I have a junker Escort wagon that I need to get towed away. It's been sitting in the driveway for a couple years now and I always keep the tires inflated to help cut down on the 'white trash' look.
Anyway, I walked by it the other day and the right front tire, which has tons of tread left, had come completely apart. Sidewall blown out, de-capped, etc. And that was just sitting there!