I don't know if they still use the stuff, but when I was a kid we were all warned to not touch dry ice or we could get a bad burn. Restaurants would throw their dry ice out behind on the ground in the alley to get rid of it. Even in the winter the ice cakes would sit and smoke, evaporate not melt. Being kids we would kick it and touch it bare fingers, but our elders were right: it did burn and if you tried to take a chunk home it would all be gone by the time you got home, so it wasn't much fun to play with.