* AlternativeCharacterInterpretation: Occurs in-universe and lampshaded/discussed in "The Nightman Cometh"; the rest of the gang notes multiple times that Charlie's play reads more like the account of a child being molested by an adult in his sleep than the romantic epic fantasy he envisioned. This also raises some distressing questions about Charlie and his relationship with his increasingly creepy uncle both in and out of universe.
* BadassDecay: Inverted with Frank, who becomes more insane and CrazyAwesome with each episode. Subverted with Mac, who, despite his delusions, was never badassed to begin with.
* BigLippedAlligatorMoment: The giant sea turtle floating in outer space during the end credits of ''Charlie Rules the World''. However, it's a BrickJoke to one of Frank's line that is easy to forget. Still, it's just way too weird of an ending.
* {{Crazy Awesome}}: Charlie and Frank.
** Country Mac. It's even ''lampshaded'', with the Gang noting what an insane badass he is.
* CrossesTheLineTwice:
** In "Frank Sets Sweet Dee On Fire", in which he does so ''twice''.
** "A Very Sunny Christmas," which crosses the line so many times it's impossible to count.
** The "DoesThisRemindYouOfAnything" parts of "The Aluminum Monster Vs. Fatty Magoo".
** Dee literally does in "Dennis & Dee's Mom is Dead".
** Charlie eating cereal and watching cartoons in his underwear [[spoiler: and Dennis and Dee's grandfather's Nazi uniform cap]] at the end of "The Gang Finds a Dead Guy"
* DudeNotFunny: Happens a lot, but usually ends up being funny due to RefugeInAudacity (of the "CrossesTheLineTwice" variety)
* EarWorm:
** [[http://www.youtube.com/watch?v=TzaVd6zl2bA Day Man!]] (uh-AAH-uhhh), Fighter of the Night Man! (uh-AAH-uhhh)
** Flip, flip, flip-a-delphia! Flip, flip, flip-a-delphia!
** The "[[http://www.youtube.com/watch?v=ntkekOFl5GY Birds of War]]" theme performed in "The Gang Wrestles for the Troops".
* EnsembleDarkhorse:
** Rickety Cricket and Artemis.
** Dennis and Dee's biological dad also counts.
** The [=McPoyles=].
** Despite only showing up a few times so far, the Lawyer has gained a following due to being one of the only outsiders who's gotten a handle on how to deal with the gang's outrageous behavior, trumping them consistently and effortlessly since the entire gang is legally clueless.
** Country Mac is a one episode character but quickly became beloved due to being a CrazyAwesome BadassGay.
* FriendlyFandoms: With Film/PacificRim, due to the presence of Charlie Day (and possibly the fact that [[{{Keet}} Newt]] is basically a marginally-smarter version of Charlie...).
* GrowingTheBeard: The show really came into its own during the second season, adding Danny [=DeVito=] as a contrast to the main four, turning Dee away from the CloserToEarth trope and generally going for more manic, darker, exaggerated tone.
* HilariousInHindsight: A year after the episode premiered, there was [[{{Ink}} a movie released]] that bears a striking similarity to The Nightman Cometh.
* HollywoodHomely: A RunningGag. Dee is actually pretty hot, but the rest of the Gang and her mother talk about her like she's the ugliest person on the face of the Earth. Lampshaded in "Who Got Dee Pregnant?", when the Gang's attempts to find the father of Dee's baby results in them discovering that Dee's getting more ass than all of them combined.
* IdiotPlot: Most of, if not all, of the plots. It helps that they're all just the kind of idiots the plot requires.
-->'''Dennis:''' I'm just saying that the plan was genuinely dumb! ...[[LampshadedTrope As many of our plans are, I now realize.]]
* JerkassWoobie: Charlie, Dee and Mac.
* MagnificentBastard: The Lawyer. In one episode, the gang repeatedly pesters him for different legal reasons, like for patents and a job contract, their tactics involve assaulting his secretary, stalking him, hiring him a hooker, threatening to rape his wife (as an act of good faith), up until, he gives in, resolves all their troubles legally, and gets the inventions to patent. Then at the end, he reveals that the contracts everyone signed gave him the profits from any and all sales of the inventions, as well as a restraining order from them (and back-up copies because the first was eaten in an attempt to stop him).
* MemeticMutation:
** Charlie gets a LOT. Notably:
*** Wild card, bitches! YEEEEE HAAAAAAW!
*** Pretty much everything about Day Man.
*** Green Man is also exceedingly popular.
*** A case of HeyItsThatGuy in ''Film/PacificRim'' led to jokes about "{{Kaiju}} [[http://elleskinner.tumblr.com/post/55834750961/this-took-way-longer-than-it-should-have-and-i Mittens]]".
** Dee's dance that she learned from the inflatable man is second only to "Wacky Waving Inflatable Arm Flailing Tube Man" from ''FamilyGuy''.
* NightmareFuel: [[NightmareFuel/ItsAlwaysSunnyInPhiladelphia It comes with the]] BlackComedy.
* [[SignatureScene Signature Episode]]: "The Nightman Cometh" is probably the most well-known episode and is frequently cited as one of, if not ''the'' best episode so far.
* {{Squick}}: Nearly every moment with the [=McPoyles=].
** Nearly every aspect of Charlie and Frank's living habits. Charlie has such bad oral hygiene that he can effortlessly pull out his teeth without feeling anything, and he presumably doesn't change or wash his underwear as it was easy for someone to pull out after a failed attempt at a wedgie. Frank then poops wherever he feels like it because it's funny to him, and he clips his toenails with a steak knife and uses the same knife to peel fruit.
* TheyWastedAPerfectlyGoodPlot: In "Who Got Dee Pregnant?" the episode begins with the guys discussing a plan to spend the night at the city museum, dodging security and generally enjoying themselves. Though the episode was also funny, it's a shame this never came to pass.
* ThisIsYourPremiseOnDrugs: The show has been described by many as "''{{Seinfeld}}'' on crack."
* UnpopularPopularCharacter: Charlie.
* TheWoobie:
** Charlie, the ButtMonkey is often so pathetic that the viewer is intended to feel sorry for him and the gang is even moved to pity him on a few occasions. In contrast, Dee is another ButtMonkey, but she's so shrill and spiteful that she never gets any woobie moments.
** Rickety Cricket, who is introduced this way and grows steadily worse with each appearance.
* TooCoolToLive: [[spoiler:Country Mac]]
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