Professor Fate!
I met Jack Lemmon in person at a Q and A event in the 70's, and he remarked about Professor Fate: "I get more fan mail for that character than almost any other I played. Still."
For most of his career, whether in comedy or drama, Jack Lemmon tended to play the nice but neurotic milquetoast kind of guy.
But I've always thought that he was hell-on-hilarious wheels as Professor Fate in "The Great Race." Fate is a macho sort of villainous blowhard, yelling a lot of the time, and he looks great in his expensive black clothes. (Jack Lemmon himself looked good in this movie, healthy and forty-ish with moustache and curls.)
Lemmon knew to play Professor Fate as a cartoon character. Look at the early scene in which Tony Curtis (as hero "The Great Leslie") pulls Fate's fake beard off. Lemmon suddenly raises his eyebrow sky-high -- like Bugs Bunny or something.
"The Great Race" is dedicated by director Blake Edwards to "Mr. Laurel and Mr. Hardy," and Jack Lemmon pairs with the great Peter Falk (as Fate's long-suffering assistant, Max) to copycat those guys, but with more meanness.
But wait, there's more. In the final part of "The Great Race," Jack Lemmon plays a second role -- the drunken, foppish childlike King of that mythical country who is always saying, "Oh, you Great Leslie you!" TWO hilarious Jack Lemmon performances for the price of one. (Fate, disguised as the king, is told that the Great Leslie "escaped with a small friar", and replies: "The Great Leslie escaped with a CHICKEN!!"
Jack Lemmon never played a role as over-the-top as Professor Fate again. I wish he had.