...I'll be even more horribly honest and say that I have a couple people on my flist that I STILL DON'T REMEMBER WHO THEY WERE, and there is no polite way to ask that so I always hope it doesn't come up. Kind of like someone hugging you at a party and going "Do you remember that time, that we did the thing, and everybody laughed!" where you're hoping like hell you won't then be asked to Do The Thing.