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Philosophy is just applied existential crisis
(wetdry.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.
The other way around makes more sense IMO: "An existential crisis is just applied philosophy."