The host of Late Night with Conan O'Brien on NBC. In my opinon, funnier than Leno, Letterman, Kilborn and (unfortunatley) Kimmel. Though he rarely receives A-list celebrities, his skits and antics are second to none in hilarity. His show spawned the infamous character of Triumph the Insult Comic Dog.
Staying up for Conan O'Brien is worth while, even though it usually starts late because of stupid Jay Leno.