For reasons I still don't fully understand our science teacher showed us that film when I was about fifteen, and some of the scenes in it still haunt me. I slightly blame it for my fascination with post-apocalyptica (and if that's not a word, it should be).
This was in the late nineties, so long after the world was expecting nuclear war at any moment, so I have no idea why she showed it - parts of it she refused to watch, so I assume it wasn't just that she wasn't aware quite his brutal it is.