When I saw this ad on the Orange Line yesterday, my first thought was, "Ooh, that guy looks tough; I don't want him coming over here and ripping my cell phone out of my hands and snapping it in two." Or something like that (since I never use my cell phone on the T because, really, I have nobody to call).
Betty Noir, however, looked at that ad and wondered why the T can't hire copywriters who know how to use semi-colons; like the one that should come between "Please limit your cell phone usage" and "loud conversations can disrupt everyone around you" instead of the comma that uncomfortably rests there. So she is thrilled to report that somebody with a Sharpie has changed the comma there to a semi-colon, at least on a Red Line platform at South Station.
It's enough to make Andrew Watson wonder if there is a tribe of Grammar Vandals in Boston, armed with felt-tip markers as they fight against the forces of darkness and bad grammar.