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My wife wears two smart watches. I always give her a hard time about it. Her reasoning is that one will occasionally miscount steps or heart rate. I always ask if she knows which one is actually correct because she always errs on the side that gives the results she wants to see.

Segal's law: A man with a watch knows what time it is. A man with two watches is never sure. https://en.wikipedia.org/wiki/Segal%27s_law

> Supposedly, the saying was coined by the San Diego Union on September 20, 1930: "Confusion. — Retail jewelers assert that every man should carry two watches. But a man with one watch knows what time it is, and a man with two watches could never be sure."

FWIW, https://archive.org/details/The_Childrens_Newspaper_0609_193... shows another variation of it later in 1930, in a section of jokes for children.

One of them should really just be a band or bracelet.

I have an iPhone.

Yes, I’ve got two watches on – why don’t you?