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In The Matrix, how are babies made?
(iusearchlinux.fyi)
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.
Because shut up. /s
But really though, the entire concept of using humans as batteries is absurd. Don't think too hard about it, just enjoy the movie.