Bradley Cooper explains how watching Christian Bale stay in character on American Hustle on weekends unlocked his understanding of method acting“The first day I met him, he was his accent. And the rest of the movie, even on weekends it was him, Christian. And I could we would talk about stuff and his kid, but he would just speak in that voice.”“And I was like, 'Oh, it's that simple.' Like it's not some big thing. Like once you get the voice, that is the weird thing.”