Will Ferrell as Harry Caray – David Letterman May 5, 2015Entertainment / Humor / Videos & Pictures Will Ferrell as Harry Caray – David Letterman YouTube caption: The late Chicago Cubs broadcaster makes a surprise appearance in Dave’s audience. Related Posts: Jennifer Lawrence and David Letterman Sing!President Obama and David Letterman Talk About Their…Celebrity Top Ten Things I've Always Wanted to Say…Will Ferrell hits a Laker girl in the face with a BasketballCelebrity Jeopardy SNL 40 Anniversary With Will…David Gregory Quits NBC - Humiliated After Showdown…Britney Spears and her Boyfriend David Lucado Break UpBritish Aid Worker David Haines Beheaded by ISISDavid Spade on Kanye West - Jimmy Kimmel LiveHarrison Ford "Get the F*ck outa my house" -…Billionaire Alki David Farts into Microphone on Red CarpetDavid Blaine - Barstow CoolComments