This fake movie trailer is based on one of the most innovative and mind-bending graphic novel series (I think) of all time. The main character is usually the titular Sandman (also known as Dream or Morpheus) and the stories told in each volume take place in the dreams of various people. Dream logic rules so random events and symbolic imagery are prevalent. Really the only constant in the Sandman series from volume to volume are The Endless: Dream, Destiny, Despair, Delirium, Destruction, and Death, as well as periodically The House of Mystery, and Cain and his ever-murdered brother Able.
This would be an INCREDIBLY difficult movie to pull off since it would have to capture the majestic and terrifying sensation of dreaming that the comics do. Also there are so many intersecting story-lines and powerful themes it could be overwhelming. But then again I thought the same thing about Watchmen...and lo they're actually making it! If the Watchmen trailer is any guide they did it well too, so the time might be right for the Endless to step from the page and onto the screen.