Best Role Playing
Fourth time's the charm, or so it was for Sean Penn, whose ''Mystic River'' performance earned him his fourth Oscar nomination, his first win, and a standing ovation from his peers. Aside from a brief reference to his prewar trip to Iraq, Penn resisted the urge to go political and gave a gracious speech. ''If there's one thing that actors know, other than that there weren't any WMDs, it's that there's no such thing as 'best' in acting,'' said Penn, giving props to his fellow nominees. In fact, the often prickly performer slipped quite easily into the role of happy winner.