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Trivia: It's Always Sunny in Philadelphia
  • Actor Allusion: In "Sweet Dee has a Heart Attack", Frank escapes a mental institution in the same manner as Chief Broom in One Flew Over The Cuckoo's Nest. Danny De Vito played a minor character in that movie.
  • Channel Hop: In an effort to attract interest in FX's new comedy-oriented spinoff channel FXX, Sunny will air its 9th and 10th seasons on the new channel. It's also worthy to note that The League and Legit will also make the hop this fall (Archer was supposed to go to FXX as well, but, instead, stayed on FX and went from airing on Thursdays to airing on Mondays). Read more about it here.
  • The Danza: Charlie Kelly is played by Charlie Day, Mac is played by Rob McElhenny, and recurring character Artemis is played by Artemis Pebdani.
  • Defictionalization:
    • Those dick towels they were trying to market? You can buy them, but don't Google them if you're on a shared home computer or on a computer in a public setting (read: library, computer lab at school, etc).
    • Greenman, which has not only been defictionalized, but is well on its way to cultural phenomenon status.
    • Recipes for "milk steak", a dish Charlie apparently made up in "The Waitress Is Getting Married", have appeared online.
    • And now fans have done the same for Rum Ham (not to be confused with an existing recipe for wussy, rum-glazed ham). It tastes pretty awful, but it'll get you good and wasted.
  • Dyeing for Your Art: Rob McElhenney gained 50 pounds in order to prove a point about sitcoms for season 7.
  • Jossed: A fan theory is that The Waitress's name is Nikki Potnick because she couldn't find her name tag at her high school reunion and Frank had stolen the "Nikki Potnick" tag. During his "Ask Me Anything" for Reddit, Glenn Howerton said in no uncertain terms that "the Waitress is NOT Nikki Potnick."
  • The Other Darrin: An eighth season promo uses this as a gag.
  • Romance on the Set:
    • Mac & Sweet Dee are married in Real Life, as are Charlie and the Waitress (which makes the whole Running Gag of Charlie stalking the Waitress Hilarious in Hindsight).
    • Dennis and that pharmacist from "The DENNIS System" are also married, and when the episode is done on stage Rhea Perlman plays Dennis's fake grandmother.
  • Real-Life Relative:
    • Will Sampson's son played the "Chief" Expy in the One Flew Over The Cuckoo's Nest Shout-Out.
    • Danny DeVito's daughter Lucy has had a couple of one-shot cameos in "Mac bangs Dennis' mom" and "The Gang find a dumpster Baby".
  • What Could Have Been: The original pilot (without Dee) was called "It's Always Sunny in Los Angeles". It featured Glenn, Rob and Charlie as struggling actors trying to pitch a TV show and Morena Baccarin as Carmen the transsexual

Miscellaneous fun facts:

  • When series creator Rob McEllehny was asked a question about his character Mac in a featurette, he replied "I don't know... I just show up, say my fuckin' lines, and go home."
  • Charlie's play The Nightman Cometh was for a while actually touring various cities around Philadelphia with all of the original cast members.
  • Charlie Day revealed that Charlie's rat-killing speech in "Charlie Kelly: King of the Rats" is basically how he got his role in Pacific Rim.
  • According to Charlie Day, during a recent interview on Conan O'Brien, Danny DeVito has stated that he's up for pretty much ANY storyline the show might throw at him save for one topic: prison rape. Apparently, DeVito informed series creator Rob McEllehny that was the only type of shock plotline that he refuses to have anything to do with.note 
  • The writers of Game of Thrones were such big fans of the show that they ended up writing "Flowers For Charlie".
    • Rob McElhenny also landed a small role on LOST after meeting co-creator Damon Lindelof, who is a big fan of the show.

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