I had a weekend in London last summer. Whilst walking across Tower Bridge, I bumped into a musical acquaintance from Leeds who I haven't seen for ages and ages. I had a lovely generic chat with him and his family, who I'd never met before. The conversation was slightly awkward, but I put it down to the randomness, and the bustle of people around us.
I messaged him a week or so later to say it was nice to see him... slightly puzzled, he replied to say he was currently in Kefalonia, and had been for the previous three weeks.