David Benioff

It's never sunny in Westeros, but that doesn't mean the guys from "It's Always Sunny in Philadelphia" can't pay a visit ... and the guys behind "Game of Thrones" want to make that happen. The unlikely alliance of shows began in 2013, when writers David Benioff and D.B. Weiss penned an episode of…

David Benioff is one sick bastard ... 'cause the "Game of Thrones" co-creator tells TMZ he was actually LOOKING FORWARD to shooting the Bobbitt-ing of Theon Greyjoy scene for "quite some time." Benioff -- who runs "G.o.T." along with D.B. Weiss -- was leaving the gym in L.A. yesterday when we…