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Showers soak more then pools
(hackertalks.com)
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.
Maybe pool water is heavier? Shower water is aerated and is more sticky?
Maybe.
Also maybe it's a chemical thing, like the pool water having chlorine (and probably a few other chemicals) in it makes it bond to you less readily.