We've had some great - and not-so-great - moments in show history, but David Letterman's appearance today may have topped them all.

The Late Night legend sat down with Query for a one-on-one interview before yesterday's IndyCar Series finale in Sonoma and hit on a wide range of topics, mostly focusing on his hometown. Dave spoke of his alma mater's inevitable closing, Broad Ripple's and Indianapolis' noticeable changes since he grew up here, and his beard's future. Take a listen: