Watch Martin Short Perform a Funeral Song for David Letterman

Jeffrey R. Staab/CBS
David Letterman on "The Late Show with David Letterman" on Oct. 13, 2014 on the CBS Television Network. 

David Letterman is going out, but he’s not going down. Tell that to Martin Short. The comic actor was a guest on The Late Show, where he serenaded the soon-to-retire talk-show legend with a dark ditty.

“I’ve had this number prepared from some time,” Short told his host and the audience. “To be honest, I wrote it for your funeral.”

David Letterman Reveals Final Musical Guests 

Short unleashed a performance filled with gallows humor and blasts from the past. For his big finale, the actor bellowed "farewell, we’ll meet again, someday in hell” as a sign lit up the stage with the unfortunate phrase, “Rest in Peace, Dave!". Check out the clip below.