Ingrid Bergman was one of the greatest actors of all time. Much later in her career, (after Casablanca), in 1974, she was in Agatha Christie's "Murder On The Orient Express".
It's a small role, actually, BUT.... the scene of her being interrogated by Poirot runs 5 minutes?, (I think), without a cut, (continuous), and is IMHO one of the greatest acting scenes of all time. I have looped the scene for viewing many, many times... and it gets better ever time.
In all honesty I do not think any performance has ever been 'acted' any better... not ever, not by anyone. - JamesJM