How All the Late-Night Hosts Have Paid Tribute to David Letterman

O'Brien called Letterman the "North Star" of comedy for people of his generation during a tribute on his show. He also told a story about taking over the Late Show back in 1993, and how something like that would never happen today. It's really wonderful to watch O'Brien reflect back on his early days and how Letterman asked to appear as a guest to support him. "It was like the Beatles asking Maury Povich if they could stop by."