In which film did Kevin Kline win a best supporting actor Oscar?

Kevin Delaney Kline (born October 24, 1947) is an American film and stage actor, comedian, singer, and voice artist. He has won an Oscar and three Tony Awards and is a 2003 American Theatre Hall of Fame inductee.

Kline began his career on stage in 1972 with The Acting Company. He has gone on to win three Tony Awards for his work on Broadway, winning Best Featured Actor in a Musical for the 1978 original production of "On the Twentieth Century", Best Actor in a Musical for the 1981 revival of "The Pirates of Penzance", and Tony Award for Best Actor in a Play for the 2017 revival of "Present Laughter".

He made his film debut in "Sophie's Choice" (1982). For his role in the 1988 comedy hit "A Fish Called Wanda", he won the Academy Award for Best Supporting Actor. In 2003, he starred as Falstaff in the Broadway production of "Henry IV", for which he won the Drama Desk Award for Outstanding Actor in a Play. He has been nominated for 2 Emmy Awards, two BAFTA Awards and five Golden Globe Awards.

"A Fish Called Wanda" is a 1988 British-American heist comedy film directed by Charles Crichton and written by John Cleese. It stars Jamie Lee Curtis, Kevin Kline and Michael Palin as a gang of diamond thieves who double-cross one another to find stolen diamonds hidden by the gang leader. A barrister (Cleese) becomes a central figure as femme fatale Wanda (Curtis) uses him to locate the loot. It was Crichton's last film.