Harry: What does this song [Auld Lang Syne] mean? My whole life, I don’t know what this song means. I mean, ‘Should old acquaintance be forgot’? Does that mean that we should forget old acquaintances, or does it mean if we happened to forget them, we should remember them, which is not possible because we already forgot?
Sally: Well, maybe it just means that we should remember that we forgot them or something. Anyway, it’s about old friends.
When Harry Met Sally