Everyone Will Die
I was at school, must have been 13 or 14 and we got to watch a video in class, always an exciting moment as it meant we didn't have to do any work.
It made almost no impact on me when I first watched it. I was in class and watching a grainy copy from the telly with a class full of kids sniggering when the lady peed herself.
Watching it again as an adult earlier this year I was horrified by the vision of incompetance, futility and misery we would face in the event of a nuclear war.
Those that survive will envy the dead.