Say it with me: dammit!

It's really annoying being this bad with names and faces. I mean, it would be bad enough not remembering any of the names of the five or six people that I thought I'd met before. Especially when dealing with groups, there are reasonable bluffs and graceful covers. One or two names are enough to make an entrance; and even remembering none can be worked around (I have this problem a lot, so I've picked up a few useful tricks). But not being entirely certain if I'd actually met them is just too much, because most of my little gambits rely on keeping things moving quickly enough that nobody ever goes, but who the hell are you? Which is the kind of thing that groups of people are actually kind of likely to do when complete strangers come up to them acting like long-lost friends.