Will Ferrell Is Very Serious About St. Patrick's Day | Letterman

Will is all dressed up for a special performance of "Danny Boy" on St. Patrick's Day. (From "Late Show," air date 3/17/15) #WillFerrell #StPatricksDay #Letterman Subscribe to Letterman: https://bit.ly/3GeOIAg Follow Letterman on Social: Facebook:   / davidletterman   Instagram:   / letterman   Twitter:   / letterman   Welcome to the Letterman YouTube Channel, home to all your favorite clips from Late Night and Late Show - as well as conversations with the writers, producers and performers who helped make it all happen. These highlights have been artisanly-produced, carefully-curated, and chosen completely at random by an old computer that used to pick numbers for the New York Lotto back in the 90’s.