All that happened a long time ago, but in 2001 I went to a event in the next bigger town. There were lots of people strolling around, suddenly a girl greeted m

All that happened a long time ago, but in 2001 I went to a event in the next bigger town. There were lots of people strolling around, suddenly a girl greeted me a little bit too enthusiastic. I didn't know her at all, but greeted her and started small talk with her. She was obviously bugged and asked me if I didn't know her ? I declined, but she didn't give up. She thought she knew me from a party from a town about 15km away and had an affair with him on this party. She was very angry, that I didn't recognise her and didn't remember any thing. She even knew which school this guy went to (different school) and some things about his friends. She didn't trust me that I wasn't this guy and was pretty angry that I didn't recognize her. Never met this guy. Don't know if he was really so similar to me, but it was a really strange experience.