David Letterman recently guest-starred on The Late Show with Stephen Colbert, marking his final appearance before its conclusion.

From the start of his career as a late-night television star on CBS, Stephen Colbert shattered the long-established broadcast network mold for who and what makes a late-night host.

Before their rooftop adventure, Letterman took to the couch to chat with his successor – he arrived to a standing ovation from the audience and the house band’s rendition of the White Stripes’ “Seven ...