It's always jarring to see your favorite funnyman in a role that is decidedly anything but side-splitting, but we personally love it when actors switch up their flow once in awhile. Brad Pitt can do Burn After Reading, so why can't Will Ferrell in turn play an alcoholic divorcee in Everything Must Go, right?

With Chris Rock shifting gears to more dramatic fare in the upcoming Julie Delpy flick 2 Days in New York, we thought we'd celebrate his career experimentation by highlighting the other definitive moments in Hollywood history when a comedian decided to button it up. Click through for The 20 Best Serious Performances By Comedians.

Written by Frazier Tharpe (@The_SummerMan)

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