David Letterman

“You realize this is being broadcast, don’t you?”

Shaffer was the host's bandleader for over 30 years, but at first he said no.

His move from rival NBC changed the landscape of late-night television.

Film follows late-night host on a trip to Dublin, where Bono and the Edge deliver a live performance and discuss friendship.

He knows Stern as a "completely different guy" today.

Get ready to go down a classic comedy rabbit hole.

These interviewers were so out of pocket.

To mark the anniversary of the comedian's final 'Late Show' episode, we've rounded up 18 of his most memorable late-night moments.