Will Ferrell Brought Out His Harry Caray Impression For David Letterman

No matter that Will Ferrell busted out his Harry Caray impression just a couple months ago, he's back again! This time, he's not a leprechaun, and he's in full Harry mode — complete with a loud tie and wacky hair. He pops up briefly in the audience, then he invites himself to the stage to ask David Letterman about his retirement. Honestly, this just reminds us how much we miss Ferrell on Saturday Night Live! Letterman has a ton of guests lined up for his final shows, so this is really just the tip of the iceberg leading up to May 20.