Last night, I noticed an odd notification. It looked exactly like a 'conversation' between two users, and the notification went to nothing when clicking on it. It wasn't like any of the other notifications in my feed, and I don't think I should have seen it. I think I've seen @MJ or @AL post about this behavior as well. If I did get a conversation notification that I wasn't the intended recipient of, then this is a pretty big deal on a social networking site.