Once while at 38 we had bought some beers for a post climbing drink. So to keep them cold we put them in the creek and covered with rocks. They were tied up in a plastic sack. So after the days climbing we uncovered our beers and took them back to the car, only to find that we were one short. Appearantly someone uncovered the beers took one, re-tied the bag, put it back in the creek. I guess it's good they only took one and not the whole bag. It was actually rather funny.