There were all kind of star-studded guests on the last The Late Show With David Letterman, but maybe the most memorable (and definitely the most classy) was not even on that show. Conan O'Brien, in an absolutely unselfish manner told all his at home viewers to "Turn On Dave" during his own program! In 22 years of air, Conan had never done that before. Kudos!

He did actually say:

"Record us, but switch to Dave."

Now that's how you pay homage to a legend.