This video explains more about the SAGE system I wrote about last week, the huge Airforce used in the 50s to the 80s to make us feel safe from supersonic Soviet bombers.
Dag Spicer from the Computer History Museum leaned over and unscrewed a bolt. Underneath, it read, "I can't stand it". The operator's job was to look for cold war bombers that never came. I would go mad, too. Look: