Will Ferrell is one of the funniest actors to emerge in the 21st century. He got his start on "Saturday Night Live," where he became famous for everything from impersonating George W. Bush to playing an always-irritated Alex Trebek on "Celebrity Jeopardy." From there, he transitioned into an A-list comedic leading man, with Ferrell's best movies allowing him to play childish, immature characters who manage to grow up, even if it's only slightly.

Ferrell's a skilled screenwriter, too, with credits on "Anchorman: The Legend of Ron Burgundy," "Step Brothers," and "Eurovision Song Contest: The Story of Fire Saga." But sometimes the best material isn't even in the script and comes when two actors are simply in the moment. You never know when inspiration is going to strike, and Ferrell's a tale

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