The “Late Show” hosts reprised a classic bit before a F-bomb ending.

Colbert’s “pissed off” predecessor returned to the Ed Sullivan Theater to mock CBS/Paramount for giving him the ax and toss furniture off the roof.

Letterman's appearance on the series arrived exactly one week before Colbert's final show on May 21.

Late-night television is currently in the ICU of the TV world, and it’s doubtful whether it’ll make it out alive.