I've seen my t once outside of her office, but that was planned. It was over a year ago, before she moved back here, she was in town on business and I hadn't seen her for over 2 years (during which time we'd done phone sessions), so we arranged to meet where she was staying. At the time, she was planning on moving somewhere else, so it would've been my only chance to see her and she knew that it was important to me to "see" her in person again. As far as unplanned - never. And we've never talked about what would happen if we did. I imagine we would say something like "hello, nice to see you" and continue on our way.