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Star Trek transporters
(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. A showerthought should offer a unique perspective on an ordinary part of life.
That's what they do. This has been a topic in multiple episodes, a fear of multiple characters, and a plot device in a few different stories over the years.