In order to achieve the effect of clenching his mouth and talking out of one side, Joaquin Phoenix had his dentist attach metal plates to his teeth with rubber bands to hold them shut. The rubber bands weren't strong enough to hold his mouth shut, so he removed them. But the metal plates, complete with screws that slightly cut up the inside of his cheek, were enough of a constant reminder that it allowed him to play that aspect of the character. See more
Marriage, previous to The Cause, was *awful*. Awful. There's a cycle, like life. Birth, excitement, growth, decay. Death. Now... now. How about this? Here comes, a large dragon. Teeth! Blood dripping! Red eyes! What do I got? A lasso. And I whip it up, I wrap it around its neck, and I wrestle! Wrestle! Wrestle him to the ground. I snap up, I say "Sit, dragon!" Dragon sits. I say "Stay!", dragon stays. Now it's got a leash on. Take it for a walk. And that's what-where we're at with it now. It ...