One of mine:
I was visiting a small place I've been to before, so I knew several people there from my previous visits. I was walking across a square when this guy looks at me at smiles. Since I have a really horrible memory for faces, I always say hello to people who indicate they recognise me - when I was younger it happened sometimes that people thought I was intentionally ignoring them when I didn't recognise them. So, this guy smiles and nods at me, and I think "aha, that must be somebody I met last time", so I nod back. He crosses over to my side and starts a conversation. While we chat, I study his face and I become more and more conviced I know this person, I just can't place him, but I believe he's a friend of a friend of mine who lives there. After a while, he suggests we have a cup of coffee, and since I have nothing better to do, I agree. After having talked for about an hour, he tells me he's from another country. I got very confused. Finally, I asked him "so, I haven't met you before?" and he looks at me like I was crazy and replies "no, of course not".
After this meeting, I thought a long time of why I had been thinking I recognised him when we clearly had never met before, but I found no solution and forgot about the whole thing.
Weeks later when I came home, I saw a ballet with Michail Baryshnikov, the famous dancer, and realised - that's why the guy had looked so familiar, he was a dead ringer of Baryshnikov. Well, it was a nice meeting
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