4 of us skipped school one sunny afternoon, drove around the county roads for a while and decided to climb this tall bluff. At the top we found a turnapo tire, (about six feet tall, about 600 lbs). We struggled to get it upright to see if it would roll. (but of course).It quickly got away from us and started down the hill side toward a farmhouse.We watched in horror as it bounced high and came down on a fence, breaking several posts and the wire, but it seemed to make it turn away from the house. It rolled and bounced past the house and came down hard on the county road taking one last huge bounce that cleared the fence on the other side. It rolled a little further in the corn and fell over. We escaped the area and laid low for a few days. I guess no one knew who did this.