it's always hilariously uncomfortable whenever you meet an old acquaintance and you two forget each other's names but you both feel that a conversation too short would be more rude than admitting that you forgot his/her name. extra bonus awkward points if you deliberately extend the conversation another 5 minutes and are able to somehow avoid having to bring up his/her name the whole time.
Since I teach and I'm bad with names, I *always* run into former students and find I'm unable to remember their name. I've actually gotten good at feigning a surprised look of recognition and chatting for several minutes without attempting to bring up a name. It works especially well if I can at least remember which class they took from me.
Of course, it was especially embarassing when a former student came into my office several weeks ago and I stood and introduced myself....what a dork.