--> You can view the main page [[WesternAnimation/AdventureTime HERE!]]
---> Tropes A-C [[AdventureTime/TropesAToC HERE!]]
---> Tropes D-H [[AdventureTime/TropesDToH HERE!]]
---> Tropes S-Z [[AdventureTime/TropesSToZ HERE!]]
----
[[foldercontrol]]

[[folder:I]]
* IAmLegion: Up A Tree has a ShoutOut to ''Franchise/PiratesOfTheCaribbean'', woodland creatures living in a tree all in unison repeat this mantra: "In the tree, part of the tree."
* ICannotSelfTerminate[=/=]MercyKill:
** In "Trouble in Lumpy Space", there's a conversation where Finn thinks Jake (in the throes of the Lumps) is about to request this of Finn, should he go completely Lumpy. It's never actually stated, and it turns out that Jake just wanted Finn to still be friends with a Lumpy Jake. "What did you ''think'' I was saying?"
** Parodied in "Holly Jolly Secrets", where Beemo can't press the snooze button for his alarm function himself. It's against his programming.
* IDontLikeTheSoundOfThatPlace: The Badlands, the Scary Dark Forest, the Desert of Doom, the Sea of Sure Death...
* IWantMyBelovedToBeHappy: The overarching theme of the episode "Betty". [[spoiler: After the Ice King is reverted back to Simon by a magic-negating entity known as Bellanoche, he uses Hambo as a catalyst to open a portal to the past to speak with Betty and let her go so she doesn't have to suffer from what he went through. She jumps through the portal to the present and immediately takes the initiative to save Simon's life, taking him to Bellanoche, knocking her out since she has no magical powers to take in the first place, and restoring Simon back to the Ice King. At the end of the episode, she silently watches his oblivious self from a window before flying off on a magic flying carpet]].
* IJustWantToBeBeautiful: The Tree Witch. She's still evil, though.
* IJustWantToBeLoved: Snorlock.
** [[spoiler: The Ice King]].
* IJustWantToHaveFriends: [[Really700YearsOld Marceline]]. [[CharacterDevelopment Though she's gotten better.]]
** Even prior to Marceline was the Ice King, whose want for friendship was actually a secondary goal aside from princess capture. When Marceline and Ice King finally meet each other, let's just say [[spoiler: their pasts play a vital part in the other's want for friends]].
* ITasteDelicious: Almost said word-for-word when Jake eats a crayon drawing of himself in "The Jiggler":
-->'''Jake:''' "I taste awesome."
** Also in "Dungeon":
--->'''Finn:''' "Everybody wants to eat me up. Probably because I'm so sweet."
** Finn's reaction to soy-people.
* IceCreamKoan: The Royal Tart Toter's speech at the Royal Meeting. Justified, as he is very senile.
-->'''Royal Tart Toter:''' "This cosmic dance of bursting decadence and withheld permissions twists all our arms collectively. But, if sweetness can win, and it can, then I'll still be here tomorrow to high-five you yesterday my friend. Peace."
* IcePalace: The Ice King's lair.
* AnIcePerson: The Ice King.
* IceWorld: The Ice Kingdom, of course.
* IfIHadANickel: After he [[spoiler:frees Tree Trunks from the power of a crystal apple]], Jake tells [[spoiler:Tree Trunks]] if he had a penny for every time someone has been driven mad with magic power... he'd be Abraham Lincoln.
* IgnoredAesop: Played dead straight in "What Was Missing". [[spoiler:After the group opens the door, the Door Lord refuses to give them back their things. Then they realize that the lesson he wanted them to learn was that [[ThePowerOfFriendship friendship is the real treasure]], and the Door Lord happily celebrates over their FridgeBrilliance moment. They ''then'' proceed to beat the Door Lord to a freakin' pulp and retrieve their stuff anyway. Wow.]]
** AccidentalAesop: Don't steal!
* IllKillYou: Used in various episodes. [[ComicalOverreacting Not always justified.]]
* IllTellYouWhenIveHadEnough: Happens to Clarence after [[spoiler:Ghost Princess dies. He does nothing but eat soft cheese... until he ''explodes''.]]
* ImAHumanitarian: [[spoiler:Lady Rainicorn's parents]] try to eat Finn, and are later seen enjoying a soy-based human substitute. Which they share with Finn and Jake, who both find it delicious.
* ImplacableMan: The eponymous character in "Hitman".
* ImplausibleDeniability: Happens with Jake and the Witch in "The Witch's Garden".
-->'''Jake:''' I never ate your donuts.\\
'''Witch:''' Well, you're eating one ''right now!''\\
'''Jake:''' ''(mouth stuffed and holding a donut)'' No, I'm not...
* ImpossibleThief: In "City of Thieves", Penny steals the clothes off of Finn's back ''without him even noticing''.
-->'''Jake:''' Whoa, dude. Why are you naked?\\
'''Finn:''' WHA!! '''[[SayMyName PEEEEENNYYYYYYY!!!]]'''
* ImpossiblyDeliciousFood: The tarts. So much that they require a special transport chamber to carry them through, or "tart burglars" will try to ''steal'' them.
* ImprobableWeaponUser: Finn, theoretically. "[[WordOfGod In a pinch, [...] [Finn] will use whatever is lying around.]]" [[http://www.formspring.me/MrMuto/q/183653586096396426]]
* InJoke: Several to character designer Natasha Allegri's cat Pancake, both visual and spoken.
* IndirectKiss: In "Burning Low", [[spoiler: after Finn and Flame Princess ''direct'' kiss caused FP to burn through the Earth's crust, Finn decided to kiss a rock and give it to FP where she also kisses the rock.]]
* InfoDump: Oh boy, "The Lich" can pretty much take the cake. After finding The Enchiridion in the possession of [[spoiler: Billy]], Finn flips the sword on the cover, revealing pretty much everything about The Enchiridion and how the plot of Season 5 will move forward. Through the explanation of a MotorMouth hologram named Booko, it is told that the Enchiridion has a secret power when combined with the Gems of Power in the crowns of all Ooo royalty. Needless to say, this explanation comes out of nowhere and floors everyone. Quote: "[[spoiler: What you see here is a map of the Multiverse. It shows all known dimensions and the links between each of them. This is the dimension that currently contains the universe in which we currently reside...At the center of the Multiverse is a dimension called the Time Room, believed to be the quasi-coporeal dwelling place of the almighty Prismo! The Time Room is a single dimension that exists outside of time. The Time Room produces the Time Waves that are experienced by other dimensions. Some dimensions have permanent links that allow travel to and fro. Others become linked temporally by naturally forming wormholes, and others can become linked artificially by magical portals, torn open by objects of great power. Once the last gem is inserted into the Enchiridion, it will have the power to create a portal to any dimension in the Multiverse. An activated portal creates a time dilation in which either end of the portal experiences a temporal synchronization allowing for the same passage of particles through a non-local region of space-time]]!" All this was said in under a minute.
* InherentlyFunnyWords: Every frackin' episode.
* InkSuitActor: Ricardio may well be the creepiest example ever. Basically, take GeorgeTakei's face, and paste it, in frightening detail, on an animated heart.
** Prince Gumball looks surprisingly like [[Creator/NeilPatrickHarris NPH]].
* InnocentFanserviceGirl: Peanut Princess.
* InnocentInnuendo: In "Fionna and Cake" shortly after Cake sends Fionna off alone with Prince Gumball [[DoesThisRemindYouOfAnything to his room]], she begins hearing strange noises that sound suspiciously like rape, but is actually [[spoiler:Fionna fighting Ice Queen]].
-->''(from far away)'' Urgh, URGH! ''GET IT OFF ME!''\\
'''Cake:''' [[MamaBear FIONNA?!]]
* InnocuouslyImportantEpisode: [[spoiler:"Tree Trunks"]]
** [[spoiler: "In Your Footsteps"]]
** [[spoiler: "Play Date"]]
* [[InsideAComputerSystem Inside A Talking Video Game System]]: Finn and Jake are sucked into Beemo's video game ''Guardians of Sunshine'' in the episode... "Guardians of Sunshine".
* InstantAwesomeJustAddNinja: Be prepared to subtract diamonds.
** The entire episode of "The Chamber of Frozen Blades".
* InstantExpert: Averted when Finn asks the robot swordsman if he can become a master swordsman after their brief duration of practice. The robot replies "Yes, if you keep this practice up for 10 years, and if you gain a robot body like mine." Finn still has a lot to learn.
* InterSpeciesRomance: Jake and Lady Rainicorn. Any romance with Finn is also this by default since he's the last human in Ooo. [[spoiler: Maybe.]]
* InvisibleWall: Beemo's video game ''Guardians of Sunshine'' has this feature; it represents the edge of the screen.
* InvisibleMonsters: Forget ''that''; Finn and Jake go through an entire invisible ''obstacle course'' in "Rainy Day Daydream" which only Jake could see because it was in his imagination. "A bowl of baby elephants, [[ChainsawGood chainsaws]], and doo-doo's flying towards us! JUMP, DUDE!" [[spoiler:Soon they come to a ''completely'' invisible monster, who can't be seen by either Finn ''or'' Jake.]]
* {{Irony}}: The fact that a post-apocalyptic world could be so bright, colorful, and happy (most of the time). Pen has pointed this out numerous times.
* IrrevocableOrder: The basic plot of [[spoiler:"Hitman".]]
* IrritationIsTheSincerestFormOfFlattery: Played with in "In Your Footsteps", in which a bear starts imitating Finn. Finn doesn't have a problem with it until he believes the bear is trying to outright impersonate him. It turns out [[spoiler: neither one was the bear's real goal]].
* ItWasHereISwear: Repeatedly subverted in "In Your Footsteps". Each time the bear does something strange, someone acts like this trope is in effect, only for it to turn out everyone already believes them.
* ItsAllMyFault: Finn's exact words when his plan to carry the tarts through the Desert of Doom fails.
* ItsAlwaysSpring: Or summer. Unless you are in the Ice Kingdom, yes.
* ItsLikeIAlwaysSay: A textbook example, since Jake has never actually said this in the show.
-->'''Finn:''' And like you always say, "Work and fun don't mix..."\\
'''Jake:''' "...Unless you're a clown." I ''do'' say that a lot.
* ItsTheOnlyWay: The driving point behind the episode "Another Way".
* IWillTearYourArmsOff: In the season 6 opener, [[spoiler:Martin, Finn's father, is responsible for detaching Finn's arm. In "The Tower," Finn resolves to tear off Martin's right arm and use it as his own.]]
[[/folder]]

[[folder:J-L]]
* JadeColoredGlasses: After years of fighting evil, Billy found it completely pointless. Also [[spoiler: Finn during the early part of season 6, after losing his arm and having Princess Bubblegum trick him into realizing that wanting revenge on his dad isn't good.]] Instead of going back to his old, cheerful self, he spends several episodes in an emotionless haze [[spoiler: until his real arm grows back.]]
* JerkWithAHeartOfGold: Donny the Grass Ogre and Marceline.
** While to a lesser extent, Jake and the Ice King work this trope. Jake embodied this trope in "Party Animal" and City of Thieves" when he, despite good intentions, did a lot of harm. The Ice King is ultimately a lonely man looking for love who is NotEvilJustMisunderstood and [[spoiler: a TragicVillain]]. His actions are extreme but his goals don't involve anything completely evil.
* {{Jerkass}}: The Magic Man ([[LampshadeHanging and self proclaimed, to boot!]])
** Donny, at the beginning of his episode of the same name.
** Xergiok.
** Marceline's ghost friends, Wendy, Booboo, and Georgy. They didn't care whether Finn and Jake ''died'' and actually ''intentionally'' attempted to ''suck out their guts'' as a '''''joke'''''.
** Sir Slicer.
** [[spoiler:Marceline's ex-boyfriend Ash]], from the episode, "Memory of a Memory", ''big time''. He [[spoiler:sold Marceline's prized possession, a teddy bear (the one Simon gave to her) she'd had since she was a little girl, to a witch for himself and ''wonders why she breaks up with him''! Plus, he tricked Finn and Jake into making Marceline ''forget'' that he's a jerkass.]]
* JigSawPuzzlePlot: What happened during the apocalypse and extinction of humanity, and how the bright land of Ooo came to rise from the ashes has been left mostly a mystery. A few flashbacks,mentions, and circumstantial evidence paint a picture: Pre-fall mankind started the "Great Mushroom War"--at first thought to be a DeadlyEuphemism for a nuclear holocaust, it turned out that the "Mushroom Bombs" were similar but distinct from nukes (possibly literally powered by evil energies). The specific effects of the Mushroom Bomb are unknown, but preventing one of them from falling would have allowed human life to continue in some fashion for another millenium. The fallout from the mushroom bombs created a ZombieApocalypse of slimy oozing goo mutants, as well as the proto-Candy People (giant possibly alive globs of bubblegum) which outnumbered other living creatures within a few decades, with slime and bubblegum growing to cover most surfaces. While the present day Ooo doesn't have anything specifically like the goo monsters [[spoiler:(at least, you don't see anything like them until they show up in "James")]], the Candy People are alive and well.
* JourneyToTheCenterOfTheMind: "Memory of a Memory".
* JumpScare: Sleepy Sam's [[HellIsThatNoise scream]] in "Guardians of Sunshine."
* JunglePrincess: [[DepartmentOfRedundancyDepartment Jungle Princess]].
* JustEatGilligan: [[AvertedTrope Averted]] in "The Limit". Jake actually suggests stretching over the maze to skip the obstacles, but Finn points out the sign that says "NO CHEATING OR YOU DIE".
* KarmaHoudini: LSP could be considered one in "Trouble in Lumpy Space"; she kept making things harder for Finn to help Jake by being a {{Jerkass}} and when Finn calls her out she says she was only trying to help and makes him feel bad.
** The three {{Jerkass}} ghosts from "Heat Signature" who spend the whole episode beating up and humiliating F & J, and don't recieve any sort of punishment for their actions.
** Magic Man, who turned Finn and a bunch of other people into disfigured body parts to teach them that [[{{JerkAss}} there are people out there who are just jerks.]] He gets away scott free.
*** [[spoiler: Though the Magic Man appears to be pulling one of these again in "Sons of Mars", [[{{ItMakesSenseinContext}} what with turning Jake into himself so he dies instead of him]], the episode ends with Finn punching him in the face, so he at least gets a SLIGHT punishment for his actions.]]
** Lemongrab gets away with torturing Finn, Jake, and the Pup Gang in "You Made Me!". He even gets a [[spoiler:clone of himself.]] ''Somewhat'' justified in that he was ''insane'' earlier, and admittedly [[HeelFaceTurn stops being an asshole]] and [[TookALevelInKindness starts acting like a genuinely friendly, nice guy]]. But [[UnexplainedRecovery we never saw him apologize for anything he did after he snapped out of it]].
* KarmicTransformation: When Finn becomes a thief. The irony is that he spent the entire episode chastizing and punishing thieves.
* {{Kawaisa}}: The cute little creatures from "Conquest of Cuteness" even if they don't think of themselves as such at first. [[spoiler:The Cute King ends up {{exploit|edTrope}}ing his cuteness.]]
* KilledOffForReal: [[spoiler: Billy, Prismo, Cookie, Keeoth, the Freak Deer, Fight King, Abe Lincoln, and more.]] For a kids show, ''Adventure Time'' adheres pretty strictly to AllDeathsFinal. [[spoiler: Inverted with the Lich, who gets ''[[ItMakesSenseInContext Revived]]'' For Real.]]
* KillerRabbit: The dimple plant. Ditto Gunter.
* KissingWarmUp: Referenced in the episode "The Enchiridion." Finn opens the eponymous book to examine it and finds a page titled "Chapter 5: How to Kiss Princesses." [[FreezeFrameBonus Pausing the scene quickly]] reveals that the author recommends practicing on a Lip Monster beforehand.
* KissOfDeath: Subverted. A kiss from Death restores your memories.
* KissOfLife: Finn does this to revive Flame Princess in the episode "Burning Low."
* KnightErrant: This is essentially what Finn and Jake are, from a folklore standpoint.
* KnightOfCerebus: The Lich. [[spoiler: He'll BodySurf into snails to avoid notice while making escapes, [[ItOnlyWorksOnce destroying things that have proven effective against him in the past]], and even {{body surf}}ed into Princess Bubblegum to manipulate Finn into [[UnwittingPawn restoring his powers.]] He is also involved in Princess Bubblegum coming close to dying twice.]]
** He came back only this time [[spoiler: in the body of Billy and with a plan to open up a portal to another universe]]. His actions were so well executed, [[spoiler: he literally changed the entire show, from plot to color tones]].
* LabPet: Princess Bubblegum has a lab rat named "Science" who she not only treats like a pet, despite being involved in some of her experiments, but is also trained to actually ''perform'' some complex experiments for her.
* LadyOfWar: Warrior Princess. [[spoiler:Who later turns into Ghost Princess.]]
* LamePunReaction: The ending of "Loyalty to the King", after Finn reveals the Nice King to be the Ice King by gluing his shaved beard back on.
--> '''Finn:''' Now that's what I call a close shave.\\
'''Jake:''' ''(Shakes his head while chuckling through FacePalm)''
** From "Beautopia":
--->'''Jake:''' Hey, what kinda coffee do you want?\\
'''Finn:''' Hazelnut! Hazelnut! ...What if your name was Zelnut? And then I would be like, "Hey, Zelnut!"\\
'''Jake:''' That's terrible...\\
'''Finn:''' Hey, Zelnut!\\
'''Jake:''' ''Noooooo!'' STOP!
** From "Reign of Gunters", while the [[spoiler:Gunter clones are destroying the bottles:]]
--> '''Jake''': [[spoiler:Breaking news: that mystery plan of yours is a smash hit. *Laughs stupidly* Because the—of the glass... I guess all they care about is bottles, huh.]]
* LampshadedDoubleEntendre: Princess Bubblegum gives one in "No One Can Hear You":
-->'''Princess Bubblegum:''' He wanted our sugar, but I didn't give him any... if you know what I mean. ''(clicks teeth twice)''
** Another from "Puhoy":
-->'''Finn:''' Where I'm from, pillows and blankets are used for bedding.
-->'''Roselinen:''' (raises eyebrow and giggles)Well they're used for that here too!
-->'''Finn:''' (embarrassed laugh)
* LampshadeHanging: As offbeat as the show is, they manage to do it without it being cynical.
* LargeHam: The Ice King certainly qualifies.
** Also Finn:
--->"WE GOTTA WAHN DA '''BEEEEARS'''!!"\\
"You ''BEARS'' gotta get ''outta here''! Or you're all gonna be MELTED BAH LAVAH!"\\
"'''''IS PB OKAY?!?!?!?!'''''"
** The Earl of Lemongrab.
--->"This castle is in '''UNACCEPTAAABBBBLLLLLEEEEE CONDITIIIIOOOOOOONNNNNN! UNACCEPTAAAAAAABBBBLLLLLEEEEEEE!'''"
* LastOfHisKind: WordOfGod has it that Finn thinks he's the last human, although it's uncertain whether he truly is. There are certainly plenty of [[AmbiguouslyHuman humanoids]], though.
** Lady Rainicorn's parents thought humans were extinct before meeting him. They might have the right idea, but it's still ambiguous, since they live in the Crystal Dimension most of the time. On the other hand, since [[spoiler:they wanted to eat Finn and they regularly dine on a human-flavored soy substitute]], they might be in a position to know about this.
** [[spoiler:In "Beautopia", it's revealed that Susan Strong is most likely human.]]
** [[spoiler: "Holly Jolly Secrets" reveals that the Ice King used to be human as well, and likely lived before the Mushroom Wars]]
** Finn is now no longer the only human as BMO's creator, Moe, is still alive and human.
*** Moe might not be an example; when asked if he was human, he replies "My skin is human." Most people interpret this as him replacing the majority of his internal organs with self-built machines (due to being ''extremely'' old and frail), but some people have a [[GenuineHumanHide much darker interpretation...]]
* LateArrivalSpoiler: The preview for "Too Young" [[spoiler:shows Princess Bubblegum as a thirteen-year-old.]]
* LavaPit: Beemo's video game ''Guardians of Sunshine'' has one.
* LawfulGood: Finn [[WordOfGod according to Pendleton Ward]]. [[invoked]]
* LeaningOnTheFourthWall: "I bet I'll ''get'' that crystal eye ''and'' be back within 11 minutes!"
** And in "Paper Pete":
--->'''Jake:''' Ugh, I was reading the same paragraph over and over for like 11 minutes.
** From "Incendium":
--->'''Jake:''' Uncle Jake's gotta find you a new [[LoveInterests love interest]].
** The Ice King has an ''entire monologue'' of this while staring into a blank TV in the tree house during "Beyond This Earthly Realm". All with a completely deadpan delivery while staring directly into the camera.
--->'''Ice King:''' What do you think, Finn? Can we pull back the veil of static and reach in to the source of all being? Behind this curtain of patterns, this random pattern generator. So clever. Right here in every home, watching us from a one-sided mirror.\\
'''Finn:''' ''({{beat}}, Finn stares blankly)''\\
'''Ice King:''' Oh! Sorry, just wizard-talkin' to myself!
* LeftTheBackgroundMusicOn: How the [[SarcasmMode "Guardian]] [[ImAHumanitarian Angel"]] meets her end, while playing the xylophone.
* LegCling: The opening of the TitleSequence.
* {{Leitmotif}}: The angry red squirrel from "The Duke" has his own background music that plays whenever he shows up.
* LethalChef: NEPTR can make ''poison'' pies.
* LethalJokeCharacter: The pig in Card Wars, as far as Jake is concerned. (In practice, it seems to exist as a ''highly'' specialized counter-balance to the largely-unstoppable Corn landtype, which Jake prefers.)
* LetsMeetTheMeat:
** Naturally, the candy people. You're only supposed to eat the nonliving candy, but ''still''.
** Meat Man, [[ExactlyWhatItSaysOnTheTin the man who supplies Finn and Jake with meat.]]
* LevelAte: At least a large portion of the Candy Kingdom is made of... well... ''candy''. The sidewalks are made of peanut brittle and the foliages are made of cotton candy, for example.
* LightFeminineAndDarkFeminine: Marceline is the Dark Feminine, while Bubblegum is the Light Feminine.
* LightIsNotGood: [[spoiler:The Guardian Angel.]]
* LighterAndSofter: The Thanksgiving special "Thank You" takes a radical turn from the rest of the series, being that there is little action, little spoken dialogue and a solid [[AnAesop Aesop]].
* LightmareFuel
* LightningCanDoAnything: Lightning brings N.E.P.T.R. to life in "What Is Life?"
* LimitedWardrobe: Played straight and averted. Some characters like Finn and the Ice King always wear the same thing, while others are more varied. Princess Bubblegum especially almost always has a different outfit in every appearance. Justified in Finn's case: he apparently only HAS one set of clothes. When he loses a sock, he is forced to go sockless on one foot until it is found.
* LiteralGenie: Subverted by Prismo in "Jake the Dog":
-->'''Jake''': I wish...for a sandwich.
-->'''Prismo''': Really? You'd waste your one wish on ''that''?...Dude, I can just make you a sandwich.
** Prismo flat out tells Jake that the wishes he grants always have an ironic twist which is beyond his control and even gives Jake a lecture on the effects of not making his wish as specific as he can
*** Heck, Prismo [[spoiler: outright tells Jake the one wish he can make that will fix everything the way Jake wants it to be fixed.]]
* LiteralMetaphor: From "His Hero":
-->'''Billy:''' It's as if your words are filling a hole in my very being... Wanna watch? ''(shows hole in his stomach filling up with body mass)''
* LittleNo: Marceline's reaction when she sees the Ice King fly towards her house.
* LivingShadow: Prismo, an all-powerful being who grants any wish and resides in an alternate dimension.
* LoadsAndLoadsOfCharacters: Lampshaded in season 5's "All The Little People" when Finn is examining the contents of the bag of action figures that [[spoiler: Magic Man]] gave him.
-->'''Finn:''' C-listers, go back in the bag.
-->'''Jake:''' Who's a C-list?
-->'''Finn:''' Uh, Tiffany, Donny...he's okay. Xergiok...A buncha these guys.
-->'''Jake:''' That's not very nice.
-->'''Finn:''' Don't worry, man. They'll get involved eventually.
-->'''Jake:''' Involved with ''what?''
-->'''Finn:''' I don't know. [[{{Foreshadowing}} Involved.]]
* LogicalWeakness: It is revealed in "The Limit" that Jake cannot stretch too much or his internal organs will be easily damaged from being too thin.
** [[KillItWithWater Water]] for Flame Princess.
** "Mystery Dungeon" shows that the Ice King's magic doesn't work in hot environments.
* LongerThanLifeSentence: In the episode ''Too Young'', The Earl of Lemongrab succeeds the throne from Princess Bubblegum after she was turned into a child. He's a tyrant who routinely gives these kinds of sentences to the candy citizens throughout the episode at the drop of a hat, and when Finn and Bubblegum pull a prank on him his line when sending them to the dungeon has become a meme by itself.
--> '''Lemongrab''': "''[[NoIndoorVoice ONE MILLION YEEEAAARS!! DUNGEON!]]''" *jail door slams*
* LongTitle: The video game is titled ''Adventure Time: Hey Ice King! Why’d you steal our garbage?!!'', and its follow-up, ''Adventure Time: Explore the Dungeon Because I DON'T KNOW!''
* LookBehindYou: [[ZigZaggedTrope Zig-Zagged]] with Ice King and Scorcher in "Hitman".
-->'''Ice King:''' [[DistractedByTheSexy Look, a supermodel]]! ''(Scorcher doesn't move)'' Look, a [[HoverBoard hover board]]! ''(Still doesn't move)'' Look, the [[ApocalypseHow APOCALYPSE]]! ''(No dice)'' ''({{Beat}})'' [[GroinAttack Someone got hit in the boing-loings]]. ''(Beat)'' [[GettingCrapPastTheRadar Hit in the boing-loings]]. ''(Beat)'' [[RefugeInAudacity Boing-loings. Boing-loings.]] [[OverlyLongGag Somebody got hit in them]]. ''(Scorcher finally looks away and gets frozen)''
* LotusEaterMachine[=/=]DaydreamSurprise: In "Power Animal", [[spoiler: Finn is trapped in a machine that is powered by thoughts. He breaks out of the machine and finds that Jake has broken into the gnome kingdom where Finn is being held and they tearfully rejoice. Turns out that the machine is actually working and is one of these.]]
* LoveAtFirstSight: Finn is attracted to [[spoiler:Flame Princess]] the instant he sees her in her normal form.
** LoveAtFirstPunch: Her angrily slapping him and warning him to "never mess with [her] again" only seemed to intensify this.
--> "Dude, I think I have a crush!"
* LoveConfession: [[spoiler:In "Mortal Recoil", Finn finally admits that he likes Princess Bubblegum "a lot". However, she probably didn't hear it because of being possessed by the Lich. Or maybe she ''did''... In "Burning Low" in a moment of frustration and rage believing that Princess Bubblegum is trying to keep him away from Flame Princess out of jealousy Finn finally blurts out, "I was in love with you!" This shows CharacterDevelopment, as Finn has never used the word "love" to refer to his affections for a girl, only "like" and "like-like".]]
* LoveHurts: Finn in a literal sense with Flame Princess, as anything from touching to kissing causes him to get burned.
* LoveMakesYouDumb: So far, Finn's love for the abovementioned [[spoiler: Flame Princess]] really seems to mess up his sense of judgement, [[spoiler:even to the point where Finn was having troubles with his heroics versus his love]] though [[HeroicBSOD he agonizes over this]].
* LoveRedeems: What Finn intends to do with Flame Princess, since her father convinced him she's "evil".
* LoveTriangle: In "Burning Low", [[spoiler:this is subverted for Princess Bubblegum towards Finn towards Flame Princess. It's revealed that PB wanted to get Finn away from Flame Princess for a different reason: Flame Princess is a highly unstable fire time bomb that will go off and destroy the earth from the inside out if she's romanced too passionately.]]
* LuminescentBlush: We dare you to count how many times Finn had this in "The Real You", and for that matter, "Blood Under the Skin".
** Flame Princess literally glows brighter when she blushes.
* LyricalDissonance: Marceline's song about a fisherman.
--> "You look so cute sitting in your boat, I wanna suck out your eyeballs and rip out your throat. I wanna suck out your eyeballs... and rip out your throat..."
** The song she sings in "What Was Missing" also definitely counts:
---> "Lada-da-da-da, I'm going to bury you in the ground. Lada-da-da-da, I'm going to bury you with my sound. I'm gonna drink the red from your pretty pink face..."
[[/folder]]

[[folder:M]]
* MacGuffin: The [[MineralMacGuffin crystal]] eye in "Dungeon".
* MacGuffinEscortMission: Finn & Jake's job in "The Other Tarts."
* MacGuffinTitle: "The Enchiridion!"
* MadnessMantra: More of a Madness Song. Finn in "The Tower" sings a disturbing limerick while he builds:
--> "Baby’s building a tower into space
--> Space is where he’s gonna find his dad.
--> Daddy’s got an arm
--> And baby’s gonna harm his arm
--> By tearing it off his dad."
* MagicAntidote: In "Trouble in Lumpy Space", antidote for lumpiness isn't ''in'' the orb; the orb '''is''' the antidote.
* MagicVersusScience: "Wizards Only, Fools" centers around this trope, with Princess Bubblegum being against magic (or more correctly, the use of the term "Magic!" to [[AWizardDidIt explain away]] "mystical" things that one does not readily understand), and everyone else being for it, because...well... [[FlatEarthAtheist the characters live in Ooo]].
* MagicWand: Xergiok has one. According to Finn they are for ''wiiimps!''
* MaintainTheLie: The plot for "Her Parents". Jake has to pretend to be a rainicorn to impress Lady's parents, because rainicorns and dogs are supposed to be enemies due to a war. [[spoiler:It turns out that her parents don't care that Jake is a dog, because a dog saved Lady's father in the war.]]
* MajorInjuryUnderreaction: Finn's reaction to getting both his legs broken in two places each "No One Can Hear You":
-->'''Finn:''' (shrivels face) {{Whatever}}.
** Subverted in that he clearly ''was'' in pain, but was just trying to hide it.
*** Subverted again as he breaks the cast off his legs after finding out that he was out cold for 6 months and runs for the rest of the episode. At the end however Jake asks how his legs are to which Finn casually responds "Still broken"
** The series tends to show injuries as serious but draws comedy (and weirdness) from how the characters deal with the injuries
* MakeOutPoint: There's one in Lumpy Space, [[GettingCrapPastTheRadar and it looks suspiciously like a tongue.]]
* MakesJustAsMuchSenseInContext: "'''''PIZZA!!!!!!'''''"
* MakeThemRot: The Lich in his first appearance kills everything he passes over, even water.
* MamaBear: [[GenderFlip Cake]], when she mistakenly thinks [[spoiler: Prince Gumball tried to rape Fionna.]]
* ManChild:
** In "Loyalty to the King", Slime Princess is playing in a sandbox when she meets the "Nice King".
** Some of Ice King's moments qualify him as this too.
* MarionetteMotion: [[NightmareFuelStationAttendant Marceline's dad]].
* MarySue: InUniverse. [[spoiler:Ice King makes himself a Mary Sue in his fanfiction as the more competent Ice Queen. Specifically, she's a VillainSue.]]
** MartyStu: Again, in-universe and again justified. [[spoiler:Marshall Lee can be considered one, because Marceline's the one writing the fanfiction in "Bad Little Boy".]]
* MaybeMagicMaybeMundane: The show has two examples from season 4's "King Worm" and season 5's "Puhoy". The first one being from Finn imagining Peppermint Butler in his magic induced dream. Whether that was the real Pepbut telling Finn he was under the control of King Worm due to him [[AmbiguouslyEvil having vast knowledge of dark magic]] or just Finn's dreaming. The second one is with the Pillow World of "Puhoy". It could simply be a dream of Finn due to his dread over relationship troubles with Flame Princess, or it could be that Finn went to another world, lived there for decades and died, with him somehow being reincarnated into his real world (due to the fact that the fourth season finale "The Lich" explained that wormholes can temporarily be opened and closed at random).
** As far as Princess Bubblegum is concerned, magic is in itself mundane:
-->'''Bubblegum:''' All magic is scientific principles presented like mystical hoodoo, which is fun, but it's sort of irresponsible.
* MeaningfulName:
** Ricardio the living heart.
** Sage Bufo lives in a [[http://en.wikipedia.org/wiki/Bufonidae toad]].
* MediumBlending: Done in "Guardians of Sunshine" when CGI is used along with 2D animation.
* {{Meganekko}}: Doctor Princess.
** Princess Bubblegum in "Goliad".
* MemeticHandGesture: The whole "Adventure Time!" fist pound between Finn and Jake.
* MemoryGambit: [[spoiler:Finn uses one in "The Real You". In short, Finn was given superhuman intelligence through a pair of nerd glasses. During a science barbecue, he shows off a black hole that threatens to envelop the entire Candy Kingdom. Smart!Finn refuses to stop it, so PB removes them herself. The now-dumb Finn slays the black hole easily with no recollection of his plan, winning PB's heart.]]
* MindControlEyes: Old Lady Princess gets these by the Ice King.
* MindScrew: "Now I have a memory of ''your'' memory in ''my'' memory."
** Describes the show in general, actually. The most common response after seeing one of the "weirder" episodes for the first time is:
--->"[[FlatWhat What.]]"
** [[http://static2.wikia.nocookie.net/__cb20120427221121/adventuretimewithfinnandjake/images/9/9f/Titlecard_S4E5_returntothenightosphere.jpg The title card for "Return to the Nightosphere".]]
** Which has been [[SerialEscalation topped]] by [[http://www.flickr.com/photos/84568447@N00/7754031514/in/photostream/lightbox the title card for "King Worm".]] Warning: you may be in a state of confusion for the rest of the day. Or, heck, the entire episode, really.
** As it turns out, it is even MORE so for the voice actors. JohnDiMaggio said at a [=SupaNova=] 2012 Brisbane (an Australian con) panel that when he is given his script, he is just given numbered lines, completely without context. Thus when he sees lines like "Be calmed by my saliva" and "Yes Finn, just put it in my butt!", he has even [[UpToEleven LESS]] idea what's going on than we do.
** A Glitch is a Glitch. Every second of it.
** "Puhoy" from a subtle, philosophical level. In general, this episode is really hard to wrap your head around though the plot is simple. Let's face it; no child will even ''begin'' to understand this episode.
** The three-parter, "The Lich"/"Finn the Human"/"Jake the Dog" is a big old bundle of this. Basically, [[spoiler:Finn has a dream {{foreshadowing}} the fact that The Lich killed Billy and stole his skin. After tricking Finn into helping him, he wishes to destroy mankind, which Finn reverses by wishing that The Lich never even ever existed. They all get wishes in an alternate dimension, by the way. Makes sense? Okay. Because Finn's wish changes all of time, and he turns into a normal boy, with parents, and a normal dog - which is what "The Lich", the final episode of the 4th season, ends. It turns out that the mutagenic bomb never went off because Simon froze the bomb with his ice powers, died under it, and left Marceline (who was never bitten by a vampire, so now ages - though not as fast, since she's still half-demon). Finn steals the crown, uses it to take down a gang, accidentally detonates the bomb, gets Farmworld!Jake turned into The Lich, and is saved just in time by Jake, who wishes that the Lich's wish be that Finn and Jake go back to Ooo, safely.]] Insane, right? '''''IT ALL TAKES PLACE IN THREE 10-MINUTE EPISODES.'''''
* MindScrewdriver: "Crystals Have Power", [[spoiler: for the ending to "Tree Trunks"]]
** "King Worm" for the ending of "Evicted!" ...Er, sort of.... It might be the first time [[TheWalrusWasPaul anyone has ever]] ''[[InvokedTrope invoked]]'' a VoodooShark.
** "The Vault" for the ending of "The Creeps".
* MiniMecha: In "Hot to the Touch", [[spoiler:NEPTR builds these for Finn and Jake.]]
* MiracleGroMonster: The Bucket Knight.
-->'''Bucket Knight:''' Just add water and, EXPONENTIAL GROWTH!
* MirrorRoutine: Parodied in "Marceline's Closet" with Finn and Jake.
-->'''Finn:''' Come on, Jake, I know this isn't a mirror! You're [[LampshadeHanging doing it WRONG]], even!
* MoeAnthropomorphism: The village of house people.
* MomentKiller:
** Finn, for [[spoiler:harpooning Marceline's touching reconciliation with her father,]] even though it was awesome.
** Also, the Royal Tart Toter in "The Other Tarts", interrupting Finn and Princess Bubblegum's reconciliation hug.
* MonsterClown: The clown nurses from "Another Way", who have some sort of foot fetish which they [[FanDisservice perform on]] [[IHaveYouNowMyPretty Finn]]. It doesn't help that he faints and starts having clown nightmares.
* MonsterShapedMountain: The episode "Memories of Boom Boom Mountain", in which the titular mountain is living, has a face, and cries boulders. A female mountain, also with a living face at its peak, appears as well.
* MoodWhiplash: "Tree Trunks".
** As mentioned, Finn [[spoiler: slashing and banishing Marceline's dad in the middle of his reconciliation with his daughter]].
** Happens a little in "Mortal Folly" and "Mortal Recoil": the Lich, KnightOfCerebus that he is, did have a lot of scenes, but there was also a lot of scenes with the Ice King acting goofy and not knowing what's going on, jarring with the scenes of the relatively serious villain.
** A good example is in "Morituri Te Salutamus", in which the scenes repeatedly change between Finn violently defeating the ghost-gladiators and Jake happily singing about raising morale. On top of this, the Fight King, like the Lich, is a completely serious villain.
** "What Was Missing" starting as a super-silly "write a song" episode. But once Bubblegum calls Marceline's lyrics too distasteful, it becomes a completely serious song where Marceline confesses her feelings about Bubblegum and their past, over a droning electric bass. "I shouldn't have to be the one who makes up with you, so why do I want to?" She backs off once she realizes how confessional she's getting, but DAMN.
*** Same episode, with Finn's song, which starts out with Finn admitting that he's incredibly self-conscious of the fact that he's younger than all his friends and occasionally questions his friendship with them.
** "Holly Jolly Secrets" has this in spades at the end. Silly Ice King antics for the entire episode and then suddenly [[spoiler:the ApocalypticLog of Simon Petrikov turning into the Ice King. Followed immediately by Jake making a joke.]]
** In "Ghost Princess", there is a scene that shows Clarence and Ghost Princess on a date at a [[http://www.ghostdates.com/ Spirit Waves]] show. When Clarence tells Ghost Princess how beautiful she is, the scene cuts to Finn wildly desecrating graves.
** "In Your Footsteps" at the very end. After being followed and copied by a bear for the entirety of the episode, Finn proceeds to tell it off at Jake's behest, causing it to run off into the woods and cry. Luckily, Finn chases after it, and after giving it a heartwarming BeYourself speech, he hands the bear the Enchiridion, and it merrily goes off on its way ([[spoiler:which happens to be straight into the Lich's den, where he delivers the Enchiridion]]).
** "I Remember You" has Ice King singing a love song to Bubblegum, which soon turns into senseless pleas for love directed at no one in particular.
--->'''Ice King:''' Won't someone tell me what's wrong with meee... anybodyy... anybodyy... anybodyyy... ''(bawling)'' ''ANYBODYY!! GROD IN THE SKY, PLEASE TELL ME WHYYY!!''
*** Near the end where it shows [[spoiler: a young Marceline and Simon meeting for the first time and him giving her the toy monkey she cherishes which quickly switches to the face of The Lich that part of the next episode preview]]. For a moment there, you believe it was part of the same episode.
** The Season 5 two-part opening "Finn The Human[=/=]Jake The Dog" switches frequently between [[spoiler:Jake having funny conversations with Prismo in the Time Room and Finn's life being ruined, Finn going insane, Finn setting of the atom bomb in Farmworld, and generally [[FromBadToWorse all hell breaking loose in Finn's]] AlternateUniverse.]]
** In "Simon and Marcy", we go from laughing out loud at Simon's antics to amuse Marcy using a broken television to him, and the audience, being suddenly very concerned about Marceline's cough.
** The episode "Play Date" raises this trope to an art form. It spends over 85% of the episode playing out a light sitcom-like plot, until the sudden GutPunch .
* MoralDissonance: Season 4 is the main purveyor of this trope:
** In the episode "In Your Footsteps", Princess Bubblegum seems to be very happy with the bear posing as Finn [[GettingCrapPastTheRadar giving her the "Heimlich maneuver"]]. She even knew that it was a bear. She should have backhanded him to next Tuesday. Every episode prior to this shows PB shrugging off Finn's romantic advances, saying the age difference is the main problem. Then a bear grabs her from behind and she's okay with that? Unless... she '''[[GoodBadGirl really]]''' wants a physical relationship.
* MountainOfFood: [[DownplayedTrope Downplayed]] with Everything Burrito, which contains pretty much every common food you can imagine. Yum. Did we mention it also contains [[MasochistsMeal pans and cups]]?
** Played literally with the Rock Candy Mountains in the Candy Kingdom.
* MultipleHeadCase: Princess Princess Princess has at least five heads.
* [[spoiler: TheMultiverse]]: As revealed in "The Lich"
* MundaneMadeAwesome: The Battle cubes from "Business Time".
** Some of the powers gained in "Wizard" get this treatment, including ''Dustomancy!'' [[LampshadeHanging Lampshaded]] by Jake at one point.
---> '''Finn:''' THIS... IS... ''AWESOME!''\\
'''Jake:''' Yeah, dude! Force that enthusiasm!
** The Whistling Choir '''[[SeriousBusiness Death Match Championship]]'''.
** Finn and Jake's last two high-fives in "Five Short Graybles".
** Also from "Five Short Graybles", Princess Bubblegum doing epic superscience... To make a sandwich.
* MundaneUtility: WordOfGod says that Jake often uses his stretching powers for everyday situations due to his lazy nature.
** Gets deconstructed hard when Jake has his powers taken by a witch and is unable to do anything because he relies on his powers so much, even believing running to be magic and being unable to run properly without his powers
* MundaneWish: Oh, Hot Dog Knights, you sillies.
-->'''Finn:''' Okay. So you guys should wish to get your buddies back right?
-->'''Hot Dog Knight:''' I wish for a box! ''(box appears)'' ''Sweeeet!''
* MurderTheHypotenuse: [[spoiler: When Bubblegum found out about Finn's attraction to the Flame Princess, she discovered that FP will become physically unstable if she's submitted to too much romance, which would end with her melting her way all the way down to the planet's core. That scenario does happen, and Finn ties Jake around himself like a rope and jumps in to rescue her. Jake himself ends up getting dragged along and eventually covers up the hole. PB realizes that if Jake stayed there just long enough, the problem would be solved because FP would have no more oxygen to live. It's not that PB was intentionally trying to kill off a potential love rival, but rather trying to prevent a catastrophic disaster from endangering the Land of Ooo.]]
* MyFriendsAndZoidberg:
-->'''Ice King:''' [[WhatHaveIDone What have I done]]? I killed my only friend!!\\
'''Jake:''' But what about m--?\\
'''Ice King:''' WHY?! '''WHYYYYYYYYYYY?!!!'''
* MyGodWhatHaveIDone: Happens to Finn when he realizes that he stole something.
-->'''Finn:''' [[BigNo NOOOO!]] WhatHaveIDone?! WhatHaveIBecome!\\
'''Penny:''' [[KidsAreCruel You've become a thief, stupid!]] '''[[EvilLaugh Hahahahahaaa!!]]'''
* MysteriousParent: We don't know who Finn's real parents were, all we know is that [[spoiler: Jake's parents]] were his adopted ones. We also don't know PB's either.
** Fanon has it that [[spoiler: the apparently-sentient wad of pink bubblegum-like goo in "Simon and Marcy" was a proto-PB that eventually coagulated into humanoid form and became the PB we know, in which case she didn't have any parents.]]
[[/folder]]

[[folder:N]]
* NakedPeopleAreFunny: Naked Wizard. Frequently Lemongrab.
* NameMcAdjective: Wormy [=McSquirmy=].
* NegativeContinuity: "Ocean of Fear" establishes that Finn is terrified of the ocean, but he had no problem jumping into it four episodes earlier in "Business Time".
* NerdGlasses: The Glasses of Nerdicon. Avert PurelyAestheticGlasses because they actually '''do''' [[GogglesDoSomethingUnusual make the wearer smart]].
* NestedStoryReveal: In [[spoiler:"Fionna and Cake" it's revealed the entire episode was the Ice King reading some of his FanFiction to Finn and Jake]].
* NeverSayDie: Averted six ways to Sunday. Pretty much a OnceAnEpisode thing.
-->'''Princess Bubblegum:''' [[CerebusSyndrome If you fail...]] [[DarkerAndEdgier he'll kill]] '''[[OmnicidalManiac everyone]].'''
* NeverTrustATrailer: The previews for "The Other Tarts" as well as the title card imply that the Royal Tart Toter would have an important role. He didn't. He showed up only at the end of the episode for the sole purpose of being creepy and delivering an IceCreamKoan.
** Happened even worse with "Holly Jolly Secrets". The trailer implied several characters would show up throughout the episode. In reality, only Finn, Jake, and the Ice King had prominent roles.
** In addition, the previews for season four episode "Burning Low" all seemed to indicate that it would play out as a sordid love triangle between Peebles, Finn, and Flame Princess. It wasn't.
* NiceHat: Quite common in the series. Finn's hood, the Ice King's crown, and Party Pat's fedora are pretty good examples.
** To that, let's add Marceline's sunhat in "What Was Missing".
* NiceGuy: Finn has this in spades.
* NiceJobBreakingItHero: When Finn releases the Lord of Evil from the Nightosphere.
** [[spoiler:Finn and Jake being tricked by Ash to steal the memory of his and Marceline breaking up. Finn is reasonably ticked off when he finds this out.]]
** When Finn and Jake are trying to teach Goliad how to be a good ruler, [[spoiler:they inadvertently lead her to use her powers for evil.]]
** Let's face it, they're pretty prone to this despite their efforts. [[spoiler: Jake having Fire Princess released to cheer Finn up only to find she was evil. Not only that but it was later revealed there was a reason she was in her prison in the first place as her unstable emotions could potentially destroy the whole world. Then there's Finn attacking prematurely during the trial with Abe Lincoln who was starting to believe that Magic Man (really Jake in his body. MM had switched them around to avoid capture) wasn't who he said he was. Resulting in Jake getting accidentally vaporized and Lincoln having to sacrifice himself to revive him. Oh yeah and giving the The Enchiridion to a bear who was under The Litch's control.]]
** The episode "The Lich" has this in spades, with Finn spending the entire episode breaking things due to [[spoiler:being tricked by the Lich into helping him use the Enchiridion to open a portal to the multiverse, where he escapes into and pulls Finn and Jake with him.]]
*** The follow-up episodes "Finn the Human" and "Jake the Dog" carries this on as well. [[spoiler: To prevent all the pain and death the Lich had caused, Finn wished for the Lich to have never existed. The end result is an AU!Earth which by all accounts is even worse off than Ooo!Earth. Two beloved characters are killed, one becomes the new EldritchAbomination and AU!Earth enters a new nuclear fallout. Or at least the area Finn resides in.]]
** In "Frost & Fire", Finn instigates a feud between Ice King and Flame Princess in order to relive an erotic dream, resulting in [[spoiler:the destruction of the ice land, displacing the snowmen and penguins, and Flame Princess breaking up with Finn when she realizes the entire feud was his doing.]]
* NinjaPirateZombieRobot:
** Lady Rainicorn, who's half-unicorn, half-rainbow.
** The Gauntlet Dock. It's a [[MundaneMadeAwesome dock]] AND [[AwesomeButImpractical a gauntlet]]!
** Princess Bubblegum is a [[HalfHumanHybrid half-bubblegum]] scientist princess.
** The Snake-armed Ruby Brainbeast from "Tree Trunks".
** The [[LostTechnology Ancient]] [[PsychicPowers Psychic]] [[ConjoinedTwins Tandem]] [[WarElephants War]] [[BeastOfBattle Elephant]] from "The Limit"
* NoEndorHolocaust: Subverted in ''The Tower'' twice: (1) Finn builds the eponymous tower by gathering thousands of blocks of earth, trees, the Candy Kingdom, the Fire Kingdom, the Ice Kingdom (including some Gunters), etc. from all across Ooo, but Princess Bubblegum primarily wants to stop him to preserve his well-being and doesn't talk about the damage when she's succeeded; (2) When Jake knocks the tower down, it decimates nearly half of the Candy Kingdom, and yet the first thing Bubblegum complains about is losing her arm.
* NoIndoorVoice: Lemongrab; Abe Lincoln, the King of Mars in "Sons of Mars" (who is in the middle of an amphitheatre with a dome over it, which might not really be indoors...but the prosecutors at the trial don't seem to need to shout to be heard).
* NoInfantileAmnesia: Finn remembers an incident that happened during infancy where he boom-boomed (read: pooped) on a leaf and fell backwards into it and no one would help him.
* NoOneCouldSurviveThat: In "The Real You", [[spoiler: Finn risks his life by ''jumping into a black hole''. Thankfully, he used his fourth-dimensional sword to make it ''[[MadeOfExplodium explode]]''. ...So yeah.]]
* NoirEpisode: The season four episode "B-Mo Noire" is this, complete with black and white and dramatic narration.
* NonIndicativeName: There's a character named Gary the Mermaid Queen in "Witch's Garden". She is an animated human skeleton and acts rather bird-like.
** Doctor Princess is not really a princess. "'Princess' is just a surname."
** There are many kingdoms in the Land of Ooo, but many of them are ruled by princesses, which would actually make them principalities. We have seen kings and queens of Lumpy Space and the Fire Kingdom.
* NoodleIncident:
** At the start of "The Jiggler", Finn and Jake have just finished an adventure where they saved a "family" composed of a pair of watermelons, sausages, marshmallows and such (not even anthropomorphic, either), which apparently involved rescuing them from an evil citadel, a lot of fire, and Finn swallowing a little computer at some point that now makes him sing in autotune.
** In "Prisoners of Love", Jake tries to throw a flute at Ice King that immediately breaks. Jake mentions that he broke it when they "tried picking the lock to that Sad Ogre's heart", an adventure we have not seen and are not told any further details about.
** "Morituri Te Salutamus" begins with the last seconds of an incident that somehow involves a giant burger monster, a pile of cute little hedgehog-like critters, and Jake not sticking to the plan.
** PlayedForDrama in "Holly Jolly Secrets," [[spoiler: the first time the Ice King wore his magical crown, he was lost in the resulting visions it made him see, and when he took it off, he only knew that he had done something unforgivable that caused his fiancée to leave him forever.]]
*** [[spoiler: This noodle was later sauced in "Betty" when it was shown that she had left him for... him.]]
** In "Ghost Princess", some ne'er-do-well ghosts were about to fight Finn and Jake, until Clarence showed up; at which point, this exchange takes place:
--->'''Clarence:''' Hold up! These guys are with me.\\
'''Ghost:''' A'ight, Clarence, but only because of that one time when I did that thing by accident, and you were cool about it.
** In "Hot to the Touch", Finn calls Flame Princess innocent, like the steam on a puppy's nose looking for ham in the snow. Jake responds:
--->'''Jake''': A guy drops one piece of ham in the snow and he never hears the end of it!!
** Magic Man's incident with Margles on Olympus Mons, which is apparently the origin point of his jerkish nature.
** What exactly happened to Lemongrab when [[FreezeFrameBonus Princess Bubblegum fed him asparagus]]?
---->'''Lemongrab''': Mommy, don't make me more asparagus. It will be the end of me, if you know what I mean.
** What exactly led to Princess Bubblegum sticking Lemongrab in Castle Lemongrab? More importantly... what in the name of God was ''in that vial of fluid she poured on his face''!?
* NoodlePeople
* NotDrawnToScale: Finn looks noticeably taller in "The Creeps". [[{{Jossed}} He's not any older though.]]
** WordOfGod says he was wearing lifts.
* NotQuiteTheRightThing: In "Ignition Point", Finn and Jake foil an assassination attempt on [[EvilOverlord Flame King]]. Their feeling of triumph is diminished when they learn that the assassins were just trying to [[YouKilledMyFather avenge their father]] and that Flame King and his entire court are evil.
* NotMeThisTime: One episode has Princess Bubblegum order Finn and Jake to capture the Ice King, even though he objects, claiming to have done "no recent crime." PlayedWith because he ''did'' do something, but accidentally.
** In "Princess Monster Wife" when Finn and Jake confront the Ice King over the princesses' stolen body parts he says he's not the culprit and he's just as concerned as they are, as the thief might come after his own princess. It turns out this princess is made from the body parts of different princess, he was the culprit and he thought they were talking about another body part thief.
* NotQuiteDead: [[spoiler: Happens ''twice'' with the Lich. The first time, he is defeated by Finn and his sweater, but he [[BodySurf body surfs]] into Princess Bubblegum, who is accidentally dropped into the well of toxins by the Ice King. The second time, while taking control of Princess Bubblegum's body, he is frozen and shattered. No dice. He body surfs ''again'' into the waving snail.]]
** We see [[spoiler: Me-Mow ''fall off a cliff'' after Wildberry Princess' body explodes. Me-Mow somehow hitches a ride on a bluebird, thus preventing a messy end]].
* NotWhatItLooksLike: Happens in "Fionna and Cake" when Cake finds [[spoiler:Fionna with Prince Gumball in his room in front of his bed with her dress torn]].
-->'''Cake:''' RAAAH!! ''(attacks Gumball)'' ''[[MamaBear DON'T YOU TOUCH HER!!]]''
* NoYou
** From the original pilot:
--->'''Pen:''' That's ''stupid!''\\
'''Ice King:''' Your ''hat'' is stupid!
** From "Death in Bloom":
--->'''Death:''' You can't kick me because [[BigStupidDoodooHead your brain is stupid!]]\\
'''Finn:''' ''Your'' brain is stupid!!
* [[NuclearNasty Nuclear Nasties]]: "Simon and Marcy" shows us just how bad things were during the early days after the Mushroom War devastated everything, including mutations that were leaking glowing green goop from orifices in their body where eyes, ears, noses, and others should have been.
[[/folder]]

[[folder:O]]
* {{Oculothorax}}: Gork.
* OddFriendship: The Snow Golem and the Fire Wolf pup in "Thank You".
-->'''Finn:''' I thought Snow Golems and Fire Wolves hated each other...\\
'''Jake:''' Oh yeah, bigtime.\\
'''Finn:''' But they learned to get along...\\
'''Jake:''' Yep...
** Flame Princess and Cinnamon Bun bond over their mistrust of Princess Bubblegum. She's nicer to him than Bubblegum and he's completely honest with her, unlike Bubblegum or anyone else for that matter.
* OffModel: Many fans complained that Jake was this at the beginning of "Crystals Have Power".
** Used intentionally in "King Worm"-- during the dream, the ears on Finn's hat are longer than normal, returning to regular length when he wakes up.
** Some parts of "Up A Tree" tend to veer into this; Finn's face seems to shrink to a third of the size of his hat in some scenes.
* OffWithHisHead: Finn does this a lot in "Morituri Te Salutamus" to the gladiator ghosts.
* AnOfferYouCantRefuse: In "To Cut a Woman's Hair", a tree witch threatens to kill Jake if Finn doesn't get her princess hair.
* OfficialCouple: While Lady Rainicorn and Jake were just flirting cutely in the pilot, in the series, they're officially dating.
** Finn and Flame Princess appear to be this as of "Burning Low."
*** [[spoiler: Not anymore after ''Frost and Fire''.]]
* OffscreenMomentOfAwesome: The epic battle between the Lich and Billy for the fate of the world. All we saw was the brief snippet in ''Billy's Song'', which consisted of Billy kicking the Lich into his castle. Considering the Lich ultimately ended up in the Candy Kingdom being pummeled into a tree so hard he was [[SealedEvilInACan sealed in amber]] (which we ''don't'' see either), it's clear the rest of the battle was likely extremely awesome.
** Finn, Jake and the Ice King's ninja fight in "The Chamber of Frozen Blades".
** The Ice King's wizard fight in "Reign of Gunters":
--->'''Ice King:''' I wish I could tell you more about it, but wizards only, fools. Keep it tight.
** In "Earth and Water", Flame Princess and Cinnamon Bun overthrew the Flame King and [[SealedEvilInACan locked him up]].
* OhCisco: To BMO at the end of "Slow Love".
* OhCrap: Marceline in the Season Two Premier.
** Finn gets one in "Mortal Folly" when [[spoiler:the gauntlet he was given to kill the Lich is caught and crushed to pieces by him.]]
** In "Mortal Recoil" Finn and Jake both make "OhCrap" faces when [[spoiler:Princess Bubblegum gets shattered after being frozen.]]
** In "Incendium" Jake gets one when he realizes that Flame Princess is evil and dangerous.
** In "King Worm", Finn has to unleash his greatest fears upon himself in order to weaken his enemy. Cue:
--->'''Finn:''' '''The Ocean.'''
* OhCrapThereAreFanficsOfUs: In [[spoiler:"Fionna and Cake", Finn and Jake are forced to listen to the fanfiction that Ice King wrote about them.]]
-->'''Ice King:''' So, what did you think of the fanfiction I wrote about you guys?\\
'''Finn:''' ''(beat)'' Uuuuuhhhh...
* OlderThanTheyLook: Princess Bubblegum, through a combination of WordOfGod, FridgeLogic, and an off-side hint in one specific episode, despite the fact that "Too Young" could lead one to think she has a normal aging process. Creator/PendletonWard once said of Peebles that "the question is how long she's been 18," and the episode "Princess Cookies" shows PB showing up at a candy orphanage in a flashback by an adult candy citizen, looking the same as she does in-series.
* OminousOwl: The Cosmic Owl at the end of the Croak Dream. This refers to the fact that many religions see the owl as an omen of death to come.
* OminousVisualGlitch: The CGI episode "A Glitch is a Glitch" has Ice King installing a virus on the universe's motherboard, causing everything to glitch uncontrollably.
* OnceAnEpisode: In every episode, there will be a snail that is waving to the audience. Or at least his shell.
* OneShotCharacter: Huntress Wizard. Another is Jungle Princess.
* OneWingedAngel:
** Marceline, when she goes full bat.
** [[spoiler: A Lich-possessed Princess Bubblegum does this once the Lich regains his true power. He's powerful enough that he beats the tar out of Finn, Jake, and the Gumball Guardians of the Candy Kingdom with no effort, requiring an EnemyMine with Ice King.]]
*** He wasn't at full power yet. [[spoiler: He was planning to regain it after he wrecked the Candy Kingdom.]]
* OOCIsSeriousBusiness: Finn crying.
** [[spoiler: Lady speaks a full line in English, only to say that she is pregnant.]]
* OperationJealousy: Jake attempts one in "My Two Favorite People". [[spoiler: It works better on Finn than it does on Lady Rainicorn.]]
** Finn also attempts one in "Go With Me". [[spoiler:It fails miserably.]]
* OrangeBlueContrast: The title card for [[http://www.flickr.com/photos/84568447@N00/5436795917/ "The Real You".]]
** Basically, Finn and Jake.
* OscarBait: The season three episode "Thank You" was deemed "Oscar-worthy" by Cartoon Network, so they put a preview of the episode ''in a movie theater'' so that it could qualify.
* OurDemonsAreDifferent: Their blood can be used to make swords.
* OurDragonsAreDifferent: [[http://images2.wikia.nocookie.net/__cb20091211024851/adventuretimewithfinnandjake/images/c/c7/Dragon.png Very much so.]]
** Puhoy introduces a new species calld [[http://adventuretime.wikia.com/wiki/Blanket_Dragon Blanket Dragons]]
* OurGhostsAreDifferent: They have the ability to ''suck out your guts, through your brain.''
* OurGiantsAreBigger
* OurGoblinsAreDifferent: They're born from mud, apparently.
* OurGodsAreGreater: There is a four-headed deity from Mars called Grob/Gob/Glob/Grod.
* OurLichesAreDifferent: [[VileVillainSaccharineShow They're not at all funny.]]
* OurMonstersAreWeird: But then again, [[WidgetSeries so is the show in general]].
* OurGnomesAreWeirder: Oh, yes. They actually make Finn ''pole-dance'' in one episode.
* OurVampiresAreDifferent: They only drink blood because it's red; Marceline actually sucked the color out of a strawberry in her debut episode. When starving in the episode "Red Starved", she drained Princess Bubblegum , calling it 'low-grade red', but sufficient to get her out of starvation. This left Peebs looking like chewed up gum; pale, wrinkly and thin, but unharmed and quickly restored with the Spoon of Prosperity.
* OurWerewolvesAreDifferent: Finn mentions werewolves, but they have not yet been seen. But there are [[PunnyName whywolves]], werewolf like creatures born out of inquiry... and [[BloodLust blood]][[HorrorHunger lust]]. They eat house people, and are in turn [[AlwaysABiggerFish eaten by the Cosmic Owl]]. [[TechnicolorToxin Obnoxygen]], a gas given off by incredibly rude people, is toxic to them.
** Then you get into Hug Wolves, who don't eat people, but rather, [[FelonyMisdemeanor hug them]].
* OutGivingBirthBackInTwoMinutes: ''Averted'' in "Web Weirdos".
* OutlawTown: "City of Thieves"
** Candy City in the episode "The Apple Thief"
* OutOfClothesExperience: The Ice King has one when he's knocked unconscious. Mercifully, his beard inexplicably becomes longer to cover him.
* OverlyLongGag: We'll never run from the fun because we're bears bears bears bears bears bears bears bears bears bears bears bears [[IncrediblyLongNote beeeeeeeeeeeeeeeeeeeeeeeeaaaaaaaaaaarrrrrrrrrrrrrrrrrrrssssssssssssssssssssssssssssssssssssssss]]!
** ONE SECOND LATER
* OvernightAgeUp: Rainicorns age faster than dogs. Over the course of two days, Jake's children were older than he was.
[[/folder]]

[[folder:P]]
* PaperThinDisguise: Finn, Jake, and Tree Trunks' disguises in "Apple Thief" (if they can even be called that). They just cover themselves in dirt, and the bartender that they met not 30 seconds ago ''doesn't even recognize them.''
** Somewhat literal in "Daddy's Little Monster" when Finn disguises himself as a demon using a mask made out of a paper plate.
* ParentalBonus:
-->'''Finn:''' What the-- Jake! You ''never'' turn into a monster when ''I'' want you to! It's always, "Not now, Finn. I have a headache."
** From "The Monster":
--->'''Jake:''' This is gonna be as easy as... umm... mmm...\\
'''Finn:''' Easy as childbirth!\\
'''Jake:''' [[SureLetsGoWithThat Yeah, okay.]]
** All the [[ShoutOut Shout Outs]] to ''Series/{{Cheers}}'' in "Simon and Marcy".
* PassThePopcorn: Parodied with Jake eating a ''single'' piece of popcorn (while in his tiny form) throughout the entirety of "Love Games"; needless to say, all the amusing events in the episode warrant it.
-->'''Jake:''' This popcorn's not gonna last all day! ''([[IncredibleShrinkingMan shrinks]])'' Okay, now it might.
* PercussiveMaintenance: Used on a gauntlet, only for it to then turn out to be a living thing that feels pain.
* PermanentPlaceholder: The opening title theme song
* ThePigPen: Penny is pretty dirty. [[spoiler:That is until she gets literally cleansed and becomes a non-thief. ...For a short time, anyway.]]
* PinkGirlBlueBoy: Finn and Princess Bubblegum. The "blue boy" part of the trope is [[LampshadeHanging lampshaded]] by Finn in "The Silent King".
-->'''Finn:''' Look at that huge mirror! And it's painted baby blue! ''Boy style!''
* PlagueDoctor: Princess Bubblegum wears this in the episode "What Have You Done?". She was spraying a green gas that covered the candy kingdom in fog. Unsurprisingly, Finn and Jake got scared.
* PlanetOfHats: Every kingdom in Ooo seems to have a gimmick of which it is named after. For example, there's the [[LevelAte Candy Kingdom]], the [[SlippySlideyIceWorld Ice Kingdom]], [[AcidTripDimension Lumpy Space]], and many others.
* PlanetOfSteves: Apparently, all The Iceking's penguins are named Günther or at least something similar.
** Becomes somewhat more tragic as we find out that the Ice King refers to people he cares about as Gunther because of the maddness caused by his crown (at one point calling a young Marceline Gunther by mistake)
* PlayingSick: In the original storyboard for "Storytelling" Jake is not really sick. He only does says so in order to make Finn leave so that he could stay at home doing weird things while no one was looking.
* PlayingWithFire: The aptly-named Scorcher.
** This also includes the aptly-named Flame Princess, who embodies this trope with a touch of evil.
* PlotHole: At the end of "Hot to the Touch", Flame Princess goes away from Finn because she decides [[StarCrossedLovers they're incompatible]]. At the very beginning of "Burning Low" (her next episode) she and Finn are dating and are on good terms. Also, she's run away from home for some reason. ''What happened?!'' This is one of the drawbacks to having only eleven minutes per episode...
* PlugNPlayTechnology: The mechanical arm in "The Vault". Princess Bubblegum even refers to it as such
* PokeThePoodle: The Giant Worm King hypnotised Finn and Jake just to make them hug him...Well, before the episode "King Worm" came along, at least...
* PokemonSpeak: James Baxter.
* PolarBearsAndPenguins:
-->'''Ice King:''' [[HypocriticalHeartwarming No one sucks the life from my penguins except ME!]] And maybe polar bears. Because that's just nature, Gunter.
* PoliceAreUseless: In "Root Beer Guy", Princess Bubblegum tests the Banana guards' efficiency by staging her own kidnapping. [[TheGuardsMustBeCrazy The guards are completely clueless]] (and easily fooled by Jake's PaperThinDisguise), while the only one who even tries to follow the clues she left, is the Average Joe who's the episode's title character.
* PoorCommunicationKills: In "What Have You Done?" because Bubblegum doesn't adequately explain what the Ice King did and just says he "didn't do anything" Finn thinks he's going to be punished for no reason and sets him free.
** In "Burning Low", Jake falls asleep while Princess Bubblegum tries to tell him why Finn shouldn't go out with Flame Princess. He assumes that PB is just jealous, and learns almost too late that [[spoiler:PB was really trying to tell him that Flame Princess' elemental instability would cause her to destroy the planet if she is kissed.]]
** In "The Lich", if Finn actually bothered trying to ''ask'' PB for the magical gem in her crown rather than just try and outright steal it, the ending of that episode could have been avoided. Justified as Finn wants to ask the princesses but Billy tells him that they don't have the time [[spoiler: that and the princesses might suss out what's going on]] which Finn goes along with because of his hero worship
* ThePowerOfFriendship: [[spoiler:How the gang opens the door in "What Was Missing", along with the power of honesty.]]
* ThePowerOfLove: [[spoiler: Not even the Lich can withstand it. At least not until he's at full power.]]
** Also seems to be how Finn got [[spoiler: his arm back]] in "Breezy".
* PowersThatBe: The Cosmic Owl, whom the Ice King comes face to face with after falling unconscious.
* PowerUpScream: "RRRRAAAAAWWWWWRRRR!!"
* PregnantBadass: [[spoiler: Lady Rainicorn. She went with PB to save Finn and Jake from Ricardio in "Lady & Peebles". During the hospital scene, Lady Rainicorn reveals to Jake that she is pregnant.]]
* PrincessesRule: Each princess (except LSP) seems to rule one domain of her own, however humble.
* PrivateEyeMonologue: BMO delivers one in "BMO Noire".
* ProfessionalKiller: Scorcher.
** To an extent, Me-Mow.
--->"Me-Mow, Assassin Second-class. But once I take out a princess, I graduate to full membership."
* PromotionToParent: Jake for Finn, [[spoiler: Simon]] for [[spoiler: Marceline]].
* PstandardPsychicPstance: Frequently in "Rainy Day Daydream".
* PsychicBlockDefense: The crystal headbands used to block the Lich's mind control.
* PsychoSerum: The Ice King's magic crown is sort of like this. Gives you tremendous magical powers of ice & snow, makes you immortal at least in the sense that you don't age normally... also it turns you blue, makes your nose and beard grow, and slowly drives you insane.
* PsychoStrings: Happens in "Mortal Recoil" for [[spoiler:the Lich-possessed]] Princess Bubblegum when Finn leaves the room.
** Used in "Another Way" for the clown nurses.
* {{Pun}}
** Finn drops some puns in the first couple of minutes of "Slumber Party Panic".
** This from "Incendium":
--->'''Jake:''' Do you know any princesses Finn's age?\\
'''Flambo:''' Oh, yeah, I know just the skirt. And she's ''way'' hot.\\
''(cut to the Fire Kingdom)''
* PunBasedTitle: Averted with "What Was Missing", which was originally called "Door Jam". [[DontExplainTheJoke (The episode is about opening a locked door using music.)]] The crew actually prefers ''[[PetPeeveTrope not]]'' to use {{pun}}s as titles.
* PunchClockVillain:
** Literally with the Business Men. They even have a main mook with a different colored tie to tell who's the KingMook and who are regular Mooks.
** The Crystal Men in "Crystals Have Power," who are somewhat awkward about the whole thing, say they're just following orders, and have to keep themselves from getting distracted and texting.
** Scorcher seems to qualify as well, the moment his business is done, he just leaves without any further fighting.
* PunctuatedForEmphasis:
--> '''Ice King:''' Your hat is ''stupid!''\\
'''Finn:''' MY HAT! IS! AWESOME!
** From "Death in Bloom":
---> '''Jake:''' I. AM. NOT. [[ItMakesSenseInContext A... BANANA!]]
* PunnyName: Ricardio, a living heart. (Specifically [[spoiler:the Ice King]]'s.)
** Keyper from "The Enchiridion!"
** Marshall Lee, the male counterpart of Marceline.
* PuppyLove: Finn and [[spoiler:13 years old Princess Bubblegum]].
** As of Season 4, though the relationship is one-sided, Finn and [[spoiler:Flame Princess]].
*** Not entirely one-sided. But [[StarCrossedLovers problematic]].
* PurpleProse: Tiffany writes elaborate lines on his arm to use when applicable. They don't usually make sense.
* TheQuietOne: Scorcher, a hitman Ice King hires in "Hitman".
-->''(Scorcher appears behind Ice King)''\\
'''Ice King:''' Whoa, you are fast.\\
''(beat)''\\
'''Ice King:''' And ''quiet''.\\
''(beat)''\\
'''Ice King:''' And very good at dramatic silence, I like it...
[[/folder]]

[[folder:R]]
* RagnarokProofing: A lot of ancient junk from the pre-Mushroom War era has survived just fine for a thousand years, often like it had been wrecked only yesterday.
* RaisedByHumans: At one point, Finn The Human tries to raise a baby Jiggler. His heart's in the right place, but he doesn't know how to take care of the Jiggler and nearly kills it. He ends up bringing the baby back to its mother.
* RaisedByWolves: "Memories of Boom Boom Mountain" reveals [[spoiler:Finn was abandoned as a baby and adopted by Jake's parents.]]
** Half of the plot for "The Monster".
* RapidFireNo: Finn delivers one in "The Chamber of Frozen Blades".
** Finn also does one in "Hot to the Touch" after [[spoiler:Flame Princess accuses Finn of having crying as a ''power''.]]
* RapidHairGrowth: {{Averted|Trope}} and played straight. In "To Cut A Woman's Hair", after Finn learns that he doesn't specifically need princess hair to save Jake from a witch, he cuts off his RapunzelHair (which, incidentally, was revealed for the first time in the series). From then on, whenever his hair is depicted, it shown being slightly longer than the last time it was last seen. Then in "Davey" (which was three seasons later), he cuts it again to adopt a disguise. By "A Glitch is a Glitch" (which was only a few episodes later), his hair's back to the sheer length it was when it was first revealed.
** Princess Bubblegum and Marceline both change their hairstyles a lot, and they can either be long or short. They don't seem to need much time to grow it back. In addition, the Ice King has lost his beard three times: shaved off in "Loyalty to the King" (Finn did glue it back on, but presumably he didn't keep it like that), blasted off in "Mystery Dungeon," and a HairReboot in "Betty." In each instance he was back to full beardiness in his next appearance (the third instance being [[NoOntologicalInertia in seconds]], no less).
*** The Ice King's beard growth is justified because it is a result of his crown which causes his beard to grow and skin to turn pale blue and cold as he looses himself in its powers (as shown in "Simon and Marcy")
* RapunzelHair: Princess Bubblegum, Marceline, Finn, and Fionna have really long hair.
* ReadTheFinePrint: The Pledge of Ultimate Responsibility, which Finn undertakes, not realizing it involves [[spoiler: holding an asteroid at bay for the rest of his life]]
* RealDreamsAreWeirder: Season 4 episode "Worm King" manages to be surprisingly realistic in its portrayal of dreams. Finn and Jake randomly change location without question or comment (mostly) while hugely strange things initially only make them suspicious as though they can't put their finger on what's wrong. [[spoiler: Waking up into another dream makes them think they've woken up for real]] until they look in a mirror, a common way for people to notice they're dreaming in real life and become lucid because the brain doesn't know what it looks like in a mirror and presents a deformed image. Finn summons things by stating that they will occur. The random nature of the surrealistic events that occur and how they flow into one-another is very close to dreams in real life. And it is very, very weird.
* RealLifeWritesThePlot: Since Finn's teenage voice actor is developing a deeper voice, the writers decided to age up Finn from 12 to 13. They have also slowly introduced more mature themes like romance.
* RealMenWearPink: Princess Bubblegum's male counterpart, [[http://www.flickr.com/photos/84568447@N00/5793965421/in/set-72157626693885425/ Prince Gumball]].
* RealityEnsues: In "From Bad to Worse" when Finn cures just Jake, all the zombies around Jake just infect him again.
** Finn's often jerkish behavior and depression in season 4 onwards. While it's not condoned, he's the last teenage boy in a post-apocalyptic world, already had StepfordSmiler issues with his vault, and having a ton of hormones along with the awful things that happen to him would make anyone lose their kiddish innocence.
* RealityHasNoSubtitles: Lady Rainicorn speaks untranslated Korean. Often used to [[GettingCrapPastTheRadar allow for some more adult jokes or references about her relationship with Jake]]
* RealityWarper: Anything Jake imagines becomes real, for some reason. Finn eventually repeats the effect.
* TheReasonYouSuckSpeech: A very blunt one given by Finn to the Tree Witch in "To Cut a Woman's Hair", with Jake continuously and angrily shouting, "''[[StopHelpingMe DUU]][[WhatTheHellHero UDE!]]''"
-->'''Finn:''' If there's anything I've learned today, it's that I am '''[[ChickMagnet awesome]]''' at talking to ladies. And ''lady'', you are CRAZY UGLY! Having beautiful hair isn't gonna get you anywhere because you're ugly inside ''and'' out. So ugly, I want to '''throw ''up'''''. No one will ''ever'' find you beautiful. EVEEERRR. And it has nothing to do with the old chrome-dome. ''(touches his heart)'' It has to do with what's in here.
** Subverted with Jake to Bubblegum in "Burning Low", as his yelling at her turns out to be completely unjustified and based on his own wrong assumptions about her feelings. (To his credit when she yells at him right back he accepts it.)
--->'''Jake:''' '''You heartless monster! Do you have any idea how much he's CRIED OVER YOU?! Finn DESERVES to be HAPPY! Even if his BLOOPIN' face gets BURNED OFF! You should be ASHAMED!!!''' ''(throws pancake mix at PB)'' '''YOU'RE ''SICK!!!'''''
* Really700YearsOld: In "The Vault, [[spoiler:it is revealed that Princess Bubblegum is not only the ruler of the Candy Kingdom, but helped build it. She has been alive for at least a few hundred years and created everything in her kingdom with SCIENCE, including the Gumball Guardians. Finn discovers this in a [[MindScrew past-life regression session]], and calls her out on it: "PB, you're like a bazillion years old. You're not freaking nineteen! What the heck?!"]]
** In ''Adventure Time: Explore the Dungeon Because I DON’T KNOW!,'' which was written by Creator/PendletonWard (making it canonical) she is given a final age of 827.
* RedHeadedHero: Younger Billy.
* {{Reflective Eye|s}}: Jake has this in the title card for [[http://www.flickr.com/photos/84568447@N00/5019178346/ "Gut Grinder"]].
* RegalRinglets: Princess Bubblegum in her [[http://www.flickr.com/photos/84568447@N00/5619360519/in/photostream/ "glamour outfit"]]
* RelationshipUpgrade: Though the exact moment they start dating [[PlotHole is never shown]], Finn and Flame Princess are shown to be dating starting with "Burning Low."
* ReplacementGoldfish: PB can recreate anyone with a candy sample of them. [[spoiler:Like James, after he sacrifices himself so everyone else can escape the toxic waste monsters.]]
* {{Retcon}}: "Crystals Have Power".
** Gob, Grod, and Glob are ''actual deities''.
* RetGone: [[spoiler: Finn tries to invoke this on the Lich in "Finn The Human" but it ends up [[GoneHorriblyRight backfiring]]...]]
* RetiredBadass: Billy. How {{Badass}} was he? He killed '''an evil ocean'''... by '''''PUNCHING IT'''''! Still not sure? Princess Bubblegum says Billy didn't just imprison [[UltimateEvil the Lich]] in amber, he did so by pummeling him into the tree.
* RetractableWeapon: Fionna's crystal sword [[spoiler:even though it turns out to be a trap]].
** Finn's Grass Sword which spends most of the time on his wrist in the shape of a bracelet
* {{Retraux}}: The DS video game ''Ice King, Why Did You Steal Our Garbage'' features gameplay primarily inspired by ''VideoGame/ZeldaIITheAdventureOfLink''.
* ResetButton: Princess Bubblegum [[spoiler: becoming 18 again]] in "Too Young."
* RhymesOnADime: Jake.
--> "Solvin' crimes and makin' up rhymes."
** Also, the punishment for stealing boots is poots on newts.
** Choose Goose:
---> "No money for me? How about a poem for free!"
** In "Ocean of Fear", Jake convinces Finn to take an oath to speak in rhyme. Finn actually does an admirable job of it for most of the episode.
** From "Paper Pete"
---> '''Finn:''' Kitties, zitties, witties mitties, knitties, fitties, hitties, jitties, pities, cities.
* RidiculouslyCuteCritter: The Jiggler, and arguably, the candy villagers.
** The Dimple Plant, for a short time, anyway.
** The pigs[[spoiler:, even though they turn out to be evil.]]
** The Firewolf pup from "Thank You".
** Jake and Lady's pups.
* RightOnQueue: The lines in the Nightosphere. Finn and Jake wait 13 days to see Hunson Abadeer, only to go to another line.
* RingOfPower: The power rings, of course! Also, Ice King's mind-control engagement ring.
* TheRival: Played with. Princess Bubblegum and Marceline are essentially rivals but they are implied to have once [[LesYay had a much different relationship]] and are also implied to ''both'' want that old relationship back.
* RobotBuddy: NEPTR.
* RoyalWe: Employed by the Flame King.
* RoyalsWhoActuallyDoSomething: In one episode, Finn becomes king of a goblin city. He tries to be this, but the rules of the city force him to essentially be a figurehead.
** Princess Bubblegum probably counts, as she actively worked to fix the plague the Ice King accidentally caused and betters her kingdom through her scientific research.
* RPGElements: Levels, cursed objects you can't take off etc. More [=DnD=]-style than video games, and tends to only be minor elements that are only important for the episode.
-->'''Finn:''' So let me ask you a question only the ''real'' Jake could answer. Who is always next to me in my recurring elevator dreams?\\
'''Jake:''' ''(immediately)'' A half-orc shaman.\\
'''Finn:''' Okay, you're Jake.
** Another example would be when Finn and the Flame King discuss his daughter, and Finn suggests she might be 'Chaotic Neutral' rather than evil. Flame King responds that she might take a penalty to experience if she acted out of alignment, but could be changed to good.
* RubberHoseLimbs: Every character has this, unless they're [[DemBones a skeleton]].
** The one exception is Fionna, who has completely human proportions.
* RubeGoldbergDevice: How Finn fulfills his vow to make everyone happy in "Memories of Boom Boom Mountain".
** Finn and Princess Bubblegum use one to prank Lemongrab in "Too Young".
* RuinsOfTheModernAge
* RuleOfSymbolism: Pretty much the only way it makes sense that Finn's drive to get revenge on Martin results in a fully-functional arm appearing.
* RuleOfThree: In 'Princess Potluck', [[spoiler: the squirrel from 'The Duke']] shoots (and misses) Jake twice before getting a hit.
* RuleSixtyThree: Character designer Natasha Allegri came up with the idea of what it would be like if Finn and Jake were girls, named Fionna and [[FemaleFelineMaleMutt Cake]]. Other bent characters include the Ice Queen, Prince Gumball, Marshall Lee, Doctor Prince, and [[http://frederatorblogs.com/adventure_time/2010/08/30/lord-monochromicorn/ Lord Monochromicorn.]] And it all started off from her occasional visits to [[ImageBoards /co/]]'s Adventure Time drawthreads. [[AscendedFanfic Later canonized]] in the episode "Fionna and Cake."
* RunawayTrain: At the end of "Mystery Train", Finn accidentally smashes the controls of the locomotive, resulting in the train running out of control towards a broken bridge.
* RunningOnAllFours: Finn in "Go With Me".
[[/folder]]

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