Thursday, September 15. 10 P.M. Mark it in your calendar. That's when the next season is "It's Always Sunny in Philadelphia" kicks off. To celebrate the taboo-shattering gang's return, here's a promo of some of the show's most memorable obscene moments. Can you imagine how many F-bombs this show would have if it was on HBO? Fu*king mind-boggling. Easily more than "Deadwood," just so Rob McElhenney, Glenn Howerton and Charlie Day could say they did it.