Here’s Louis C.K. on Letterman last night to promote his new HBO stand-up hour, Louis C.K.: Oh My God, which premieres a week from Saturday on April 13th. Letterman got down to brass tacks and asked C.K. about an episode of Louie last season that ended with him screaming, “Fuck you, Letterman!” at the Ed Sullivan Theater from the street, and the two managed to work the misunderstanding out.