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The chef doesn't know which egg is theirs until the end.
(programming.dev)
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.
You've been in the shower too long with the water too hot. You've steam cooked your brain.