Friends, this gang is a vile collection of losers with little in the way of redeeming qualities. The show itself is never afraid to touch on dark topics, and it gets away with some decidedly non-PC humor due to the nastiness of the characters delivering it and the fact they're all idiots.
For a show that came real close to being cancelled at the end of its first season, The Big Bang Theory, and while another season has yet to be confirmed, it likely happen due to its enduring popularity.
On the surface, It's Always Sunny In Philadelphia's "The Gang Recycles Their Trash" is about another madcap scheme. A garbage men strike in Philadelphia prompts Paddy's Pub to cook up a plan to collect trash for money. Mac, Charlie, and Dennis are in charge of this part, but instead of listening to Frank's straightforward plan, they hire tuxedos and a white limo to go trash collecting, while Frank and Dee try to win the city contract away from the union. That's the plot in a nutshell, but the episode itself is intensely meta.
Ghostbusters theme playing. The episode opens with numerous callbacks to the point Dee is constantly pointing out the deja vu, while her horrible racist caricature Martina Martinez also returns briefly; hell, even the title itself is a meta gag.
It's Always Sunny In Philadelphia's "The Gang Tries Desperately To Win An Award" from season 9 went for a similar tone. That episode poked fun at the show's own lack of award recognition when compared to more -friendly sitcoms, as the gang tries - and fails - to tone down their edginess to become mainstream. It's Always Sunny In Philadelphia's "The Gang Recycles Their Trash" is an odd experiment but it works because it gamely commits to the idea, and fans will have a field day spotting every easter egg. Needless to say, the scheme backfires and despite an attempt to learn from their mistakes, they soon move on to the next ridiculous, doomed idea.