Starring: Charlie Day, Rob McElhenney, Kaitlin Olson, Glenn Howerton

Four egocentric friends who run a neighborhood Irish pub in Philadelphia try to find their way through the adult world of work and relationships. Unfortunately, their warped views and precarious judgments often lead them to trouble, creating a myriad of uncomfortable situations that usually only get worse before they get better.

It's Always Sunny in Philadelphia - Publicity still of Rob McElhenney, Glenn Howerton, Kaitlin Olson & Danny DeVito

More stills and photos from "It's Always Sunny in Philadelphia"