Definitely not spoiler free so I wouldn't highly recommend watching if you haven't at least watched some episodes and know how the story goes. It was REALLY hard to make this without showing some big scenes.
For a while now I've wanted to make a film trailer for each season as if the season were a movie. So here's the first season's trailer. It was difficult to try to present the story a little differently than it's always shown. So that's why I made it look like Dean left after Sam refused him and then Sam just went back to bed, only to go back in his mind to what had happened to them and wake up to Jess. I don't know if it works but I like it :)