As I mentioned above, I recently read a collection of Fredric Brown's works. This is my favorite of his so far:
http://www.roma1.infn.it/~anzel/answer.html
It's only a page long.
And, coincidentally, I listened to a podcast of a Lewis Padget (aka Henry Kutner) weird tale called "The Graveyard Rats." It's been anthologized many times. He wrote a lot of Lovecraft inspired stuff.