Occasionally I have a good idea, but neglect to write it down immediately, and end up forgetting it very soon thereafter; often I can ressociate my way back to it, but not always. I'm given to understand that this is not uncommon for other people, either. Only I have to wonder if it's at all telling that we remember the emotional experience of "I just had a good idea! Clearly I am a Smart and Creative Person!" but forget the idea that was ostensibly its referent. Shouldn't it be the other way around? Why, it's almost as if the deception and posturing that defines our social worlds extends even into the sacred domain of the self!
See also: cryptomnesia.