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Tooth doctor doesn't have the same ring as eye doctor
(lemmy.world)
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.
I don't quite see it, but I'm used to saying opthamologist because of Tim Minchin and I'm not a native speaker. But seems plausible.