You may think that the highlight of this video is seeing Will Ferrell [1] dressed up like a leprechaun, but it's not. Ferrell stopped by Late Show With David Letterman and treated the audience to a special throwback of one of his most famous Saturday Night Live [2] impressions: baseball broadcast personality Harry Caray. He set the stage for the impression before delving into it like it was 2000. Check it out, just be prepared for some serious nostalgia.