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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.
The full quote is "The customer is always right in matters of taste."
And it was never a saying, it was a commercial tagline.