
Or how about Elsa Lanchester in The Big Clock? With but a few minutes of screen time she steals the whole show as the flighty, judgemental and needy painter, enlisted to identify the killer (falsely accused Ray Milland while really it's her real-life hubby, Charles Laughton).
Or Noel Coward in Bunny Lake is Missing?
Or Barry Fitzgerald in The Catered Affair?
Or Thelma Ritter in anything?
Or Bert Lahr in The Wizard of Oz?
Or Melvyn Douglas in Mr. Blandings Builds his Dream House?
Or Nina Foch in An American in Paris?
Or Glenda Farrell in Mystery of the Wax Museum?
Or Ernest Thesiger in Bride of Frankenstein?
Or Madeline Kahn in Paper Moon? Or Young Frankenstein?
And speaking of Young Frankenstein, how about Cloris Leachman, Marty Feldman and Kenneth Mars? Or, hell, Gene Hackman?
Or Gene Wilder in Bonnie and Clyde?
Or Richard Pryor in Silver Streak?
Or Dudley Moore in Foul Play?
Or Jeffrey Jones in Amadeus?
Or Elaine May in Small Time Crooks?
Oh hell, there's so many to list and so little time. Give me some more time and I could knock off the drama list just as easily. One spoiler for that one: Agnes Moorehead in The Magnificent Ambersons? Probably at the top.