when you find a shed hair on the floor or furniture/etc, you're able to identify whose shed hair it is out of the other people you live with (this could be easier or harder depending on how similar or different the people's hair types/colors/lengths are)
Maybe this isn't completely exclusive to long-haired folks, but I feel like we're more likely to pay attention to this kind of thing whereas others might not really think about whose shed hair it was they found.
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