I learned something today. The proper term for someone picking their nose is "rhinotillexomania" (rhino=nose, tillexis=habit of picking at something, mania=obsession with something). So, the next time that you see a person picking their nose, tell them that they are a rhinotillexomaniac. That, or offer them a kleenex.
And no, I don't care if you think I'm childish for finding that interesting.