EXCLUSIVE: 'It's Always Sunny in Philadelphia' Stars Can't Keep It Together in Hilarious Blooper Reel

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It's Always Sunny In Philadelphia has been one of the funniest shows on television for over a decade -- and as it turns out, there are just as many laughs off screen.
In this exclusive look at the show's incredible gag reel -- a special feature on It's Always Sunny's season 10 DVD box set -- fans get a look at just how hard it is for the show's stars to keep a straight face when confronted with the hilarious, baffling lunacy that makes the FXX series so great.
Although it’s not surprising to learn that when bringing together a group of hilarious friends for a raunchy, largely-improvised sitcom, you're bound to have some pretty solid bloopers -- or uncontrollable fits of laughter that ruin tons of takes.
The 10th season of It's Always Sunny in Philadelphia -- starring Charlie Day, Danny Devito, Glenn Howerton, Rob McElhenney and Kaitlin Olson -- is coming to DVD on Jan. 5, while season 11 premieres Jan. 6 on FXX.