David Letterman

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.