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We should stop saying "The customer is always right" because it's not true
(discuss.tchncs.de)
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.
Do you have a source for this? I have tried to search for it but haven't found anything, I'm starting to suspect that it is apocryphal.