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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. A showerthought should offer a unique perspective on an ordinary part of life.
I would argue that it absolutely applies to both existentialism and epistemology. Epistemologists frequently concern themselves with questions about the limits of human knowledge and understanding without actually going there themselves.