It's Always Sunny in Philadelphia Season 7 Promo: Mac Gets Fat!

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This... can't... be!

So states Rob McElhenney in the following promo for It's Always Sunny in Philadelphia, as the show teases its September 15 premiere and the fact that Mac has gotten fat. Like, really fat. Like, 50 pounds overweight fat.

Having spoken to the actor at Comic-Con, we can vouch for his currently slim figure, but how did he lose all that weight? What extreme measures will be taken on the show? Tune in next month for a very special episode and find out.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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It's Always Sunny Quotes

Charlie: I'll totally pull a Good Will Hunting on those kids and that'll put them in their place.
Mac: How you gonna do that?
Charlie: Well, you've seen the movie right?
Mac: Yeah.
Charlie: So all I gotta do is, I'll ask them some big shot, like math or science, history-type college question aand that will totally stump them by knowing a lot more about the answer than they do.
Mac: In that movie, Matt Damon played a genius janitor, you're just a janitor.
Charlie: Right, you stumped me with that one.

Mac: He doesn't have any poison.
Charlie: I don't have any on me, but I do keep some in my fridge at home in the relish jar.
Frank: There's poison in that jar? I thought I was allergic to pickles. What's in the jar with the skull and crossbones?
Charlie: Well that's mayonnaise. It's a decoy.
Frank: And the mayo?
Charlie: That's shampoo.
Frank: You're telling I've been putting shampoo on my sandwiches?
Charlie: If you've been using the mayonnaise, then yeah, probably.