George, it's so lovely to see you again. It must be ages since we last met.
Oh, I suppose it is, but weren't you at Michael's birthday party on August twentyth last year?
No, I wasn't. I got the flu at the last minute and I went to the hospital instead. I think the last time I saw you was 3 years ago at Christmas. When we all had dinner together in that Indian restaurant?
No, surely we've met since then. Wait a minute, it was at Peter's place! When he and Jenny got married!