Do what I do, regardless of whether they're talking to themselves or not. Assume everyone is crazy, and give them a wide berth.
Why? Because believe me, it's the rather serene, sane-looking lady that totally loses it over the 50 cent overdue fine. Just a moment before she walked up to the desk you were thinking of complementing her blouse, but now, you really really wish she hadn't been born.
It's like how cops are always on their guard when they pull over a guy that ran a stop sign. You never know who's crazy and who's not.
You're a brave lady to walk the streets, and I salute you.
