We read Frederic Brown's rather short short story "Nightmare in Yellow" as part of our literacy exercise, and I mentioned other extremely short stories, as well. WIRED magazine published some extremely short stories back in 2006, for example:
We’ll be brief: Hemingway once wrote a story in just six words (“For sale: baby shoes, never worn.”) and is said to have called it his best work. So we asked sci-fi, fantasy, and horror writers from the realms of books, TV, movies, and games to take a shot themselves.
Here's the article, and the stories: WIRED Magazine, "Very Short Stories"