I have also previously written about my #5, Michel Gondry's Eternal Sunshine of the Spotless Mind, from 2004. It's one of the most interestingly done visual experiences ever put on screen, with Gondry able to project what the inside of our minds just might look like.
The crowning achievement in Charlie Kaufman's catalog, in my eyes, teaming him again with French music video director Gondry (who had previously directed Kaufman's script Human Nature, unseen by me). A haphazard journey through the memories of Joel Barish (a never better Jim Carrey) as he tries to erase his recently ex-girlfriend Clementine (the always brilliant Kate Winslet) from his mind. Kaufman started from the idea of erasing someone from your memory (who hasn't wanted to do that before?) and the impact that memories have on us as people. The way a loved one can get so associated with something that to remove it would be to remove a part of your own being. The impulsive Clem has had Joel erased from her memory by a company called Lacuna that provides such a service. As a way of getting back at her, Joel decides to erase her from his memory. Joel at one point asks Dr. Mierzwiak (the infallible Tom Wilkinson) if there's any chance of brain damage caused by the erasing. He answers "Well, technically speaking, the procedure is brain damage."
There's an achingly sad moment later in the movie when you realize that Joel doesn't remember the song "My Darling Clementine", even though it had deep meaning to him long before meeting Clem. It had become so associated with her in his mind that to remove her removes all traces of the song as well as his childhood favorite, Huckleberry Hound. For the majority of the movie we travel with Joel through the good and bad memories of the two years he spent with Clem. It's hysterical, heartbreaking, amazingly true to life while being totally surreal. Also, the brilliant score by Jon Brion is worth mentioning. It plays more like an accompaniment to the action onscreen, instead of trying to underline it, or try and inform the audience how to react emotionally. The movie is a beautiful, hilarious, and melancholy trek through the emotions one experiences with both the good and bad in a relationship, and how you should live with the balance of the two instead of trying to forget. Your memories help make you who you are, appreciate that you have them.