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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 DeVito played a minor character in that movie.
  • Channel Hop: In an effort to attract interest in the launch of FX's comedy-oriented spinoff channel FXX, Sunny was moved to the new channel along with The League and Legit.
  • The Danza: Charlie Kelly is played by Charlie Day, Mac is played by Rob McElhenny, and recurring character Artemis is played by Artemis Pebdani. Specifically averted by Dennis: Glenn Howerton did not want his real name associated so closely with the character.
  • 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.
  • Executive Meddling: A story involving The Gang getting onto Family Feud was ultimately vetoed by FX, despite the support of Feud's producers.
  • Exiled from Continuity: Averted; Rob Mc Elhenney got the idea for Charlie's "Green Man" persona from an unnamed friend, who donned a green zentai suit while attending a football game with McElhenney. McElhenney would later pay his friend an undisclosed amount of money in exchange for the rights to his "character", so that he could use the concept in later episodes.
  • "Funny Aneurysm" Moment: Stephen Collins plays the altruistic biological father of Dennis and Dee, who is active in children's charities and adopted a dozen African orphans. In 2014, Collins was recorded confessing to the molestation of multiple children.
  • Irony as They Are Cast: The cast members usually have some irony going for them:
  • 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."
  • Mean Character, Nice Actor: The main cast kind of have to be this trope, given who they have to play.
  • No Budget: The show's first season was produced at 1/3 of a typical network sitcom's budget, starred unknown actors and during production, Rob McElhenney still kept his day job as a waiter. Eventually, the budget increased with each successive season.
  • The Other Darrin: An eighth season promo uses this as a gag.
  • Romance on the Set:
    • Mac & Sweet Dee met through the show and eventually got married in Real Life.
    • The Waitress is Charlie's real life wife, which makes the whole Running Gag of Charlie stalking the Waitress some meta-irony.
    • 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".
  • Unintentional Period Piece: Thanks to the large number of references to the then current events of the Turn of the Millennium. The show debuted during that decade, as such many episodes make references and jokes that seem to be ripped from that decade's headlines, such as references to the gas crisis, terrorism, waterboarding, Hurricane Katrina, North Korea, the bar getting a new flatscreen TV and Blu-ray player, just to name a few.
  • 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 McElhenney 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 McElhenney 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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