Hated to hear it, but it was gonna happen eventually.
Growing up I wanted to be like Duvall's Gus Mcrea. Unfortunately that didn't happen, but hey my boss calls me Woodrow Call every time I get on to someone and an old man runs off to HR to complain about me hurting they're feelings when they got rude.
Whether as a real jerk in Joe Kid, Lucky Ned Pepper, Gus Mcrea, or even Robert E. Lee, Duvall could bring any character to life.