Have you been in a situation where you recall having read a book or seen a film and you general impressions but you can't recall a single thing about the story or the characters? This happens to me a fair deal, especially with short stories. The title is recognizable and I recall if the story was good/bad, but I just can't remember what actually happens in it. Maupassant's The Horla is for me the prime example of this phenomenon. I know it's a cool story that I've read several times, but if you were to ask me now what the plot was I couldn't tell you a thing.
It's a blessing sometimes when you go back to short story collections and read with fresh delight. Sometimes it just makes me mad. Like now. Gah.