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Vim is the original escape room
(discuss.tchncs.de)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
ed is much older than Linux. I'm surprised you haven't at least heard of it. I found about about it though the old AT&T Unix tapes