Don't say I didn't warn you if you fire this up and you haven't yet the seen the movie, because this video is spoiler-heavy (as in, it gives away the ending and will ruin the movie for you and we all know how much we all really freaking hate that).
The short, made by Rod Blackhurst and Trevor Eiler, is part of the Oscar campaign for the film, which is up for 10 Academy Award nominations. So it serves as a commercial of sorts for Academy voters, to help spread word about the the film and its nominations. Plus, it's pretty funny.
If you have trouble playing the video, it can also be seen here.