THE NEWS OF JOHN'S DEATH.
I haven't seen the film since it first came out when I was 22, but I have never forgotten that extraordinary moment when K.S.T. learns that "John" has died and, assuming it's John Beaver (her lover) she crumples, and when she realizes that it's not Beaver but her SON John, for a moment she has a look of relief. She collapses, but I'm not sure if it's just for the grief of losing a child or whether it's an acknowledgement of her preferring that it was her son who'd be dead rather than her lover.
K.S.T. is a superb actor, both onscreen and onstage. I have seen her in both Chekhov's THREE SISTERS and Pirandello's AS YOU DESIRE ME in London and she was stunning in both (the best Masha I've ever seen).