Nominated for an Academy Award for Best Animated Feature Film, I guarantee that you haven't seen anything like this.
1. Charlie Kaufman, responsible for writing blindingly original and strange movies like Being John Malkovich, Eternal Sunshine of the Spotless Mind, and Adaptation, has reappeared after a 7-year absence by writing and co-directing this odd and beautiful allegory.
2. The fewer details you know about the story beforehand, the better. It's designed to slowly reveal what's going on, and you'll get the most out of it that way.
3. The basic plot is about a self-help author who is so deeply unhappy with his life that his brain is re-interpreting reality for him. Then he meets an unhappy woman, and the results are... interesting.
4. This is an animated movie, but it's made for adults. There's swearing, nudity, sex, and alcohol.
5. The foundation of the movie is very melancholy, but it's also extremely funny in parts.
6. It's made with stop-motion animation, but it moves much more smoothly than most of those type of films. The puppets were created using 3D printers. The results are fascinating and a little unsettling.
7. Even though it's surreal and trippy, it manages to hit on an essential Truth about life that may not have been able to be explained in any other way.
8. If you need movies with definite events and concrete explanations, then you will want to avoid this movie.
9. This movie is one of those rare specimens that you understand deep inside yourself, but you may have trouble finding the words to explain it. It's a remarkable piece of art.