It was at my local stamp club. We didn't get many new members turning up so when one did we all to used to make a big effort to make them feel welcome. It was the night of our annual quiz and he and I were in the same team. He seemed a really nice bloke with a vast knowledge of stamps and postal history and I thought he would be a good recruit for the club. Afterwards we went for a quick drink at the local pub, he paid for a drink for the two of us, then he went off towards the gents toilet.
I never saw him again and he never came back to the stamp club. For ages I wondered what happened to him.