One of the sharpest, laugh-out-loud comedies on television is "It's Always Sunny in Philadelphia," and now the gang at Paddy's Pub have their very own Christmas special. The catch? It's exclusive to DVD and Blu-ray and it's in stores now. So what's it about? According to the studio, "Join Mac, Charlie, Dennis, Dee and Frank as they embark on a holiday adventure filled with stolen toys, childhood videos, naked elves, and a bloody run in with Santa Claus that is guaranteed to blast Christmas spirit all over you!"

To whet your appetite, we've got an exclusive clip from the bonus features which features director Fred Savage (yes, that Fred Savage) walking us through backstage, with a special appearance from Kaitlin Olson and Danny DeVito. Check it out below.

by Savas Abadsidis

The popular FX sitcom "It's Always Sunny in Philadelphia" was born as a low-budget pilot in 2005. The quirky cast of bar patrons who inhabit Paddy's Bar in South Philadelphia impressed network execs enough for a seven episode first season to be ordered, for an August 2005 premiere. Four years and four completed seasons later, the show is still going strong, with the fifth season premiere set for September 17. We got to sit down with "Sunny" star Kaitlin Olson at San Diego Comic-Con last week, who talks about what's next for the show and what she's been doing with her free time.

MTV: What’s going on in the fifth Season of Sunny?

Kaitlin Olson: What’s going on?! There’s so much going on—we tackle the economy this season—we take the economy head on. Read more...

In town for "It's Always Sunny in Philadelphia," Danny Devito dropped by the MTV studio and unsurprisingly was one of our funniest guests. Someone the conversation turned to nudity with Danny describing an upcoming episode where he bares all. "People want to see my naked body," the actor says, noting that he'd love to share the experience with a certain Angelina Jolie.

Watch him chat in the video below, and then click here for more of our video interviews from the show, including with Denzel Washington, Neil Gaiman, Anna Faris and more.

I’ve been hurting. Probably my two favorite comedies on TV—“It’s Always Sunny in Philadelphia” and “Curb Your Enthusiasm”—have been on hiatus far too long, and there’s only so many times you can re-watch episodes before your neighbors, behind thin NYC apartment walls, begin to complain. But! Larry David's “Curb” is coming back to HBO in the fall, after a two-year break. And now comes word that “Sunny,” the debaucherous comedy about four friends who run a dive bar in Philly and make one another’s lives hilariously uncomfortable, will be resurfacing on F/X on September 17th for a 12-episode run.

While Charlie Day, along with his fellow writer/producer/co-stars Rob McElhenney and Glenn Howerton are still in the midst of shooting episodes, Day stepped away from the set to kick MTV News the inside scoop about what “Sunny” fans can expect when the gang—including Danny DeVito's bundle of scummy fun, Frank—returns to the small screen.

“One of my favorite scripts right now is an episode called ‘The Gang Wrestles for the Troops,’” he said. “In our attempt to honor the troops coming back from Iraq, we try and put on a wrestling match and ‘Rowdy’ Roddy Piper is appearing in that. He’s playing a down on his luck wrestler called Da Maniac.” Read more...

Charlize Theron may be still catching up on the rollercoaster antics of MTV's hit show "The Hills," but there's at least one show business gang out there that's totally down with Lauren, Heidi & Co. And it's probably not who you'd expect...

So that said, if you've been wondering what the "Always Sunny In Philadelphia" crew has been up to in their off-time (their fourth season premiered last night on FX), well here's your answer, straight from stars Charlie Day, Glenn Howerton and Rob McElhenney. Listen to them spills the beans on a hidden Hollywood relationship in the video below.