Four Weddings and a Funeral
I used to think that Supporting Actor ranked right up there with Key Grip and Best Boy Electric until I saw KST's performance in Four Weddings and a Funeral. She is amazing to watch as Fiona, in unrequited love with the film's main character.
Her Juliette in I Loved You So Long starts out almost excessively wooden until you realize that KST has nailed her character completely. Who wouldn't be wooden after fifteen years of not trusting a soul in prison... especially given the reason for the jail term.
Juliette's slow transition is perfectly acted, a prime example of KST's talents when one considers that a movie is never filmed in sequence. The director uses many close-ups that would be unforgiving to many other actresses.
I thought this was a great film, and superb performances by both KST and Elsa Zylberstein as her sister.