I'm not sure where the line between ad and short film is, but this four-minute video—directed by Spike Jonze—is a delight. Watch the whole thing, full-screen, and then check out AdWeek's fantastic behind-the-scenes look at how the video was made.
And here's the behind-the-scenes look:
What amazed me is how they were able to create those stretch effects practically, rather than relying on digital manipulation. I love seeing talent in action like this.