No doubt about it

It is a grey hair. It is slightly longer than the adjacent hairs, but seems to have relatively the same tensile strength. It does not dislodge when gently tugged, which rules out the possibility that it could be someone else's hair that has merely become lodged in my own. I have not been in the vicinity of grey paint or bleach recently. If I pluck it out, will it return as two more of its ilk? If I cut it off just above the root, so as to not remove the hair from the follicle entirely, it will still be there (thus mitigating the plucking out/two growing back problem), but below the canopy of the rest of the normally-colored hair. Or perhaps I should apply color with my red editing pen. Perhaps I should snip it off, put it in an envelope and send it to my ex-girlfriend with a note saying, "I hold you responsible for this..."