'It's Always Sunny' Stars Talk Tonight's Episode Written by 'Game of Thrones' Showrunners

'It's Always Sunny in Philadelphia,' on the surface, couldn't appear any more different from 'Game of Thrones.' The former is a comedy about a group of pathetic friends who constantly squabble amongst themselves, while the latter focuses on an ongoing medieval war for leadership of a continent. 

But there's an unlikely overlap between the two shows, and it's happening tonight: 'Game of Thrones' showrunners David Benioff and D.B. Weiss have written tonight's episode of 'Sunny,' "Flowers for Charlie." 

The episode comes as a result of Benioff and Weiss meeting 'Sunny' star/writer Rob McElhenney in a bar and pitching him their idea for the episode -- which involved Charlie being the subject of an experiment for increased intelligence. 

Speaking to THR, McElhenney (pictured with Benioff and Weiss, above) noted that the 'Game of Thrones' showrunners have the skills needed to nail comedy, because it's just as character-driven as their own series: "They are just super brilliant guys and understand scene structure and story structure. I think a common misconception about comedy – especially a show like ours – is that it's just all jokes and that it's easy to sit down and just write funny things. Ours is a story-driven and character-driven show. It takes a specific structure to execute that, and they have that in spades."

"It was very flattering how well they knew the show and well they knew the characters, and our structure," Charlie Day, who plays Charlie, added.

"I guess we'll have to do a 'Game of Thrones,' we'll see," joked McElhenney. At least, we think he's joking. But hey, remember how darkly hilarious Season 3's "Walk of Punishment" was? I bet the 'Sunny' gang could pull off something like that. 

'It's Always Sunny in Philadelphia' airs "Flowers for Charlie' tonight at 10/9c on FX.