It’s Always Sunny in Philadelphia’s Rob McElhenney is, like many members of our species, a Game of Thrones fan. Enough so that he doesn’t mind letting Thrones co-creators/screenwriters D.B. Weiss and David Benioff write an episode, a job almost always reserved for McElhenney and his co-stars. Benioff is known for nonstop laugh-fests like Stay, Brothers, and 25th Hour, so it makes a good amount of sense.