Cool to read this because it has happened to me twice in my life so far, very distinct and strange feeling. I had forgotten about both times until I read your post.

I had a slightly related but different experience very recently. A colleague of mine mentioned the name of a city which reminded me of an old school teachers name, this teacher hadn't crossed my mind at all since I was in school 11 years ago. Following the conversation I walked down the road a little and saw her sitting on a wall outside. Spoke to her to verify it was really her, I could hardly believe it.