To quote Tom Lehrer, "I am never forget the day..." [1] I was working with WinXP, trying to reconfigure a machine's network for something abstruse. I was makin

To quote Tom Lehrer, "I am never forget the day..." [1] I was working with WinXP, trying to reconfigure a machine's network for something abstruse. I was making changes in the network configuration dialog, and kept tentatively moving forward because there was always the "CANCEL" button available to revert my changes. I made one last change, and suddenly the "CANCEL" button dimmed. It was as if you were creeping into the entranceway of a haunted castle, and after one more step the door slams shut behind you. 20 years later and I'm still scarred... [1] https://www.youtube.com/watch?v=gXlfXirQF3A&t=24s https://www.youtube.com/watch?v=gXlfXirQF3A&t=24s