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A religion is just a meme that people take seriously.
(sh.itjust.works)
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.
In the original Dawkins sense of the word, this is explicitly so. Strictly speaking, memes are just ideas that use us to replicate. A worldview is an idea. Pogrom ergo sum, so to speak.
There is a neat video from CGP Grey that discusses the infectious transmission of thoughts: Achoo!