PHILADELPHIA - The creators of "It's Always Sunny in Philadelphia" didn't just remind the world of Philly's legacy of irreverent humor and crassness - they made TV history. "Sunny" has become the longest-running live-action sitcom in American television history.

Now in its 17th season, "Sunny" has spent the past 20 years delivering iconic moments from lampooning the American zeitgeist ("Two wars?!") to creating situations only the most-depraved characters could navigate ("The Gang Finds a Dumpster Baby," anyone?).

Created by Rob Mac (formerly Rob McElhenney), Glenn Howerton, and Charlie Day, and also starring Kaitlin Olson, "Always Sunny" came out of the gate with a controversial spin on "Seinfeld's" "A Show About Nothing" formula - which Sunny would later spoof - during a time of proc

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