Yeah, sure. But my very favorite Widmark performance is the one he gave as himself at the one and only Telluride Film Festival that I ever attended, back in 1982, when the actor was one of the lifetime-achievement award honorees. Another honoree, Russian filmmaker Andrei Tarkovsky, made a spectacle of himself one evening by announcing, through a translator: "The cinema, she is a whore. First she charge a nickel, now she charge five dollars. When she learns to give it away, she will be free." Widmark was not impressed. In fact, judging by his response the following evening, he was suitably pissed. He told a cheering audience: "I want to name you some pimps. Hitchcock ... Fellini ... Bergman ... Orson Welles ..." So there.
(BTW: After Googling sporadically throughout the afternoon, and not finding any mention of this incident anywhere, I was beginning to worry that I'd only dreamed it. Thank God, once again, for Roger Ebert.)
CORRECTION: My bad – it was indeed, as Griff posts in the comments below, the 1983 Telluride Festival (not the ’82 event) where Richard Widmark laid the verbal smackdown on Andrei Tarkovsky. I should have remembered the date, because that festival was the first I ever attended (though, unfortunately, not the last) at which a far-away real-life event (in this case, the downing of Korean Air Lines Flight 007 over Soviet air space) distracted many festivalgoers from the films.