For those of you who missed it, apparently Hillary spoke in several speeches about how she had flown into Bosnia during wartime and had to run across the runway with Chelsea to avoid sniper fire. The only problem is that there's actually footage from the occasion where she's standing on the runway, accepting flowers from a local schoolgirl. Oops.
Except I somehow don't think she was lying. I think she actually misremembered.
I know that I've occasionally had a very realistic dream where I will be thinking about things a couple of days later and have a false memory drift up that's based on the dream. And I go, "Wait a minute. That never happened." I perform the appropriate edits, flag the false memory as entertaining, but false, and proceed with my life.
So imagine that you're going to be flying into a war zone with your daughter and you have one whopper of a nightmare. Now it's many years later, you're probably sleep-deprived from being on the campaign trail and not at your best anyway, and you remember the nightmare, not what actually happened, because the nightmare was vivid enough to stick with you and you did a lousy editing job on your own memory.
I find this plausible based on my own experience.
But, oh! How absolutely lousy it would sound to try to explain it! And imagine the resulting attack ads. "Hillary Clinton can't tell the difference between the real world and her own nightmares."
Maybe it's better that everyone think she's a liar. :)