David Letterman made a final appearance on the "Late Show" and bid farewell to CBS, using a phrase that included "good night and good luck, motherf*ckers." The occasion reportedly involved throwing furniture off a roof, possibly as a nod to one of Letterman's past bits. It is unclear whether Stephen Colbert is also leaving the show, as some outlets suggest his farewell, while others imply he was hosting Letterman's final appearance.