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You can totally play Tetris in your head
(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. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
This phenomenon is literally called the tetris effect haha
Also, the title of one of the best Tetris games released ever. The visual and musical artistry in that game is astounding.