Supernatural and Other People
I'm currently reading Neil Gaiman's Fragile Things, which is a collection of his short stories. Some are really good, some are pretty twisted and some are in between. But there's one in particular that struck me and immediately made me think of Supernatural.
The story is called "Other People" and once you read it you'll totally understand why it made me think of Supernatural. Dean, in particular. The story is kind of haunting if your a fan of the show, especially after what we learned of Dean's time in hell at the end of the last episode.
I would love to post the story here, but believe too much in copyright laws to do that. But I highly recommend you read it.