Memorable 'Late Show' moments

Even when CBS' "Late Show with David Letterman" veers into awkward, uncomfortable territory for the guest -- as it often does -- Letterman never loses his cool. In fact, the opposite happens: The show only gets better. Now, after more than 30 years in the business, Letterman has mastered the art of pressing just the right buttons to ensure great TV.

Even when CBS' "Late Show with David Letterman" veers into awkward, uncomfortable territory for the guest -- as it often does -- Letterman never loses his cool. In fact, the opposite happens: The show only gets better. Now, after more than 30 years in the business, Letterman has mastered the art of pressing just the right buttons to ensure great TV.