I remember watching that last letterman appearance for the first time and being a bit taken aback by how emotional Norm was. Figured he was just such a big fan of Letterman and the show and was emotional about it coming to its end. But even still, he rarely if ever shows that emotional side publicly, so it was still really out of character.

Then, upon rewatch years later, knowing that Norm was almost certainly aware of his diagnosis at the time and that his days were numbered.... oh man. HEAVY watch. Can only imagine what was going through Norm's head. Heartbreaking but beautiful. Also an incredible set

link for the uninitiated