Most Underrated Comedic Performance in Movie History??

Thomas Wilson in the BTTF series. He played young Biff, Old Biff, Middle Age wimpy Biff, Middle Age evil Biff, Griff, and Mad Dog Buford Tannen and killed it as each one.

Daniel Stern in the Home Alone movies. Incredible physical comedic performance.

Jack black high fidelity

Peter O'Toole
My Favorite Year

While I think of an answer to this thread, I'll have to use this as a place holder:

One of my favorite underrated lines is from Kyle Gas in Elf describing a children's book : we open on a farm with a group of asparagus children who are subconscious about the way their pee smells.

quote:

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The Incredible Burt Wonderstone.

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My vote for all time underrated comedy. Most people I talk to have never even heard of it. It has a great cast and plot and is a legitimately gold movie

Yeah, it's hard to beat Ted Knight in that movie. The underrated power player in the movie.

I'd go with Harold Ramis as Egon in Ghostbusters.

Alan Rickman in Galaxy Quest. He simply made that film awesome.

"Miners not minors"

"Its like throwing gasoline on a flame"

"Could you possibly try not to hit every single one!"

Christopher Guest in This is Spinal Tap

Mark Whalberg in I Heart Huckabees.