On my way in to the library the other day, I wondered what their food rules are, and whether I needed to smuggle in my water bottle. So I went looking for a sign with rules. [At the local library, you can’t throw your stuff everywhere, get naked, or pop popcorn. This must be why children under 10 need to be supervised.] And there it was: “Do not: Consume food or drink that creates a nuisance.” Now this might seem like no big deal, sandwiched between typical “don’t smoke” and “don’t expose yourself” rules. But it caught me dead in …