Fundamentally, a large "do not unplug" sign is just like any other failsafe system. Nuclear missile silos, probably the most "do not touch this switch" systems

Fundamentally, a large "do not unplug" sign is just like any other failsafe system. Nuclear missile silos, probably the most "do not touch this switch" systems in existence, are only slightly more refined, and have red covers over all the important switches instead. The alternative is to epoxy the keyboard in. But then when you legitimately need to unplug it, you need to find a hammer. As an aside, that XKCD strip feels heavily inspired by an episode of the IT Crowd [1] [1] https://www.youtube.com/watch?v=iDbyYGrswtg https://www.youtube.com/watch?v=iDbyYGrswtg