Dry Ice?

Recently, one of my sons asked for ice water. No problem, I can assist him with that, thought I. When I reached into the ice bucket, here's what I found:







At first, I couldn't figure out what had happened. Our freezer wasn't old enough to start malfunctioning; we had just bought our refrigerator last July. The ice cubes were actually not melted; that is, they were whole, but all stuck together and frozen into a single block. When I asked the boys if they knew anything about it, one boy told me that the ice was dry and needed to be wet. He had added water to our ice bucket, then stuck the whole thing back into the freezer so we wouldn't have "dry ice." *sigh. Oh, how I love that boy.