* AlternativeCharacterInterpretation: Lots of characters have different perspectives from fans.
** Is Cuddles a troublemaker who wants others to do dangerous activities, or does he want others to have fun and is unaware of how dangerous stunts can be?
** Is Giggles a slut who's more than willing to [[YourCheatingHeart cheat on her boyfriend]], did those events happen before she fell in love with Cuddles, [[BetterAsFriends or has she broken up with Cuddles before the episodes where she dates others]]?
** Is Lumpy a dimwitted moose that is a threat to civilization, or is he just trying to help his friends, but keeps on making careless mistakes that lead to their deaths?
** Is Petunia a true [[NeatFreak neat freak]], or did she [[FreudianExcuse suffer a severe illness]] that soon led her to keeping everything germ free and organized?
** Is Pop a truly [[ParentalNeglect neglectful parent]], or does he really care about his son and just simply makes careless mistakes (similarily to Lumpy)?
** Is Flaky a mentally unstable character that has a load of fears, a character that cares about her friends but is scared about facing any danger likely due to a tragic event she has faced, or is she the [[OnlySaneMan only sane character]] on the show that is trying to point out to everyone about all the dangers that happen?
** Is Disco Bear a pervert who loves flirting with women, or is he just trying to act cool and just doesn't know how to?
** Are Lifty and Shifty true thieves that truly [[AssholeVictim deserve to be thrown in prison]], or have they actually [[FreudianExcuse been poor once]] and are just [[WellIntentionedExtremist trying to avoid that from ever happening again]]?
** Is Splendid a part-time "superhero" that doesn't care about his job, or does he truly try his best to help others, but simply causes more problems than he solves?
** Is Lammy a psychopath who believes a pickle is killing others when it's really her doing all the killing, a killer that's trying to frame a pickle for all the killing, or is she a victim to Mr. Pickels who is really killing others and framing it on Lammy?
* BigLippedAlligatorMoment: The second half of ''A Sucker For Love''. Most of the episode is a random montage of Nutty's fantasy about loving, dating, marrying, [[BreadEggsMilkSquick impregnating]], murdering for, and dying old with a box of chocolates.
* CreatorsPet: Lumpy for a great part of the fanbase. It doesn't help that there were only two TV episodes Lumpy didn't appear in. In some of these he didn't have much of a role other than just to be there. This is only justified by the fact that the writers seem to work on a "take the dumbest character in the series and throw him into jobs that require brains and see what happens" system.
** Another thing pushing him into CreatorsPet territory is that he doesn't die nearly as often as the rest of the cast. [[InvertedTrope Too Dumb To Die]], maybe?
* CrossesTheLineTwice: The whole point.
* DesignatedHero: Splendid, intentionally.
* DesignatedVillain: Splendont.
* DracoInLeatherPants: Girls just can't seem to stop pairing up Flippy with their original characters... [[FanPreferredCouple or just Flaky]]. Arguably justified, as Flippy is only a Draco when he flips -- otherwise, he's a sweetheart.
* EnsembleDarkhorse: Flippy, Flaky and Splendid. There's enough pictures where they are hanging around, that people who knew nothing of the show would assume that it's only about them or as if they form the main trio of the show. The fandom created this perspective which imposed itself on the entire fanart and fanfiction. They're kinda like the [[Franchise/HarryPotter Harry, Ron and Hermione]] or [[{{Naruto}} Naruto, Sasuke and Sakura]], from the fandom's point of view. If you don't believe it, check out Pixiv, Zerochan and Deviantart. [[http://www.zerochan.net/278651# Some]] [[http://www.zerochan.net/293699 examples]] [[http://www.zerochan.net/592231 are]] [[http://www.zerochan.net/319673 here]].
* FanPreferredCouple: [[MindGameShip Flippy and Flaky]] is the most popular couple in the whole fandom . One of the reasons people prefer them together is that Flaky appears to be Flippy's closest friend despite that he has killed her several times and that she develops a phobia of him in the latter episodes. Although the fact that he has stopped killing her recently, for an unknown reason, and a few other hints imply that he may like her.
** On the girls' part, even though Cuddles / Giggles and Handy / Petunia are [[OfficialCouple official couples]], in the anime fandom Giggles is commonly paired with Splendid, while Petunia is often paired with both [[AllGirlsWantBadBoys Flippy and Shifty]]. Flaky is a LauncherOfAThousandShips, as she's paired with almost every male character in the series (especially with Flippy, with which she makes the FanPreferredCouple). She's most commonly paired with Flippy, Nutty, Lumpy, Splendid, Splendont, Cuddles, or both Lifty and Shifty at the same time (although she's more often paired with Lifty, while Petunia is more often paired with Shifty).
** On the HoYay part, [[FoeYay Flippy/Splendid]] has the largest following, especially in the japanese fandom. One of the main reasons may be that people always wanted them [[FoeYay to fight each other]] so that they could see who would win. In Japan, it is probably the most popular pairing, after [[FanPreferredCouple Flippy/Flaky]]. Other common HoYay couples are: Nutty/ Sniffles, Splendid/Splendont, [[{{Twincest}} Lifty/Shifty]], [[{{Selfcest}} Good Flippy/Evil Flippy]], Giggles/Petunia, [[OT3 Splendid with both Shifty and Lifty]], Pop/Disco Bear, Lumpy/Russell and Lumpy/The Mole.
* GermansLoveDavidHasselhoff: The show's garnered a following in Japan. Certain characters are more popular overseas as well; there's a particular contrast in popularity between East and West regarding Lumpy and Mime, whereof the former sometimes receives disturbing amounts of love.
* HarsherInHindsight: The "moral" at the end of ''A Bit of A Pickle''. If Mr. Pickels truly isn't real... oh dear.
--> We don't see things as they are, we see things as we are.
* IdiotPlot: Nearly every episode. Especially ones starring Lumpy.
* MisaimedFandom: The fact that there are quite a lot of people who make OC Tree Friends and pair them off with characters, just like in any other popular fandom, makes you wonder if they actually saw the show.
** There's a surprisingly lack of gore artwork within the fandom. It doesn't pop up nearly as much as you'd expect for the series. Instead fans opt for more realistic violence and grimdark.
** Overall, it seems that there's just as much of a fandom for the character designs and "pre-continuity" SugarBowl as there is for the main show. [[note]]Explanation: hardly any continuity, characters who could be interesting if developed enough, and opportunities for just about any genre with them - truly a fanwriter's (or artist's) dream, as your imagination is the limit while you still can "cash in" on how obscure fanwriters receive more attention than obscure writers of original works. Doesn't stop SturgeonsLaw, though.[[/note]]
* MoralEventHorizon: Shifty crosses it when he leaves Lifty to die in the submarine, just so that he could survive and have all the gold. He later receives a KarmicDeath.
* NightmareFuel: Particularly if any small children accidentally watch it. And some older viewers too, if they aren't into that sort of thing.
* TheScrappy: Disco Bear for some. At first, only co-creator Rhode Montijo liked him, but the other staff members say they warmed up to Disco Bear considerably while making the TV series, in part because they enjoyed seeing him get killed.
** Some veteran fans of the show see Lammy as a Scrappy because of her having a dark murderous side brought on by mental illness, something that's already been done with Flippy, making seem like the creators are trying to make that brand of psychopathic lightning that made Flippy so popular strike twice. Some rumors have started that [[WildMassGuessing Flippy is in fact cured (as evidenced by the fact he hasn't flipped out in years)]] - or, since ''On My Mind'', getting better - meaning Lammy could be another [[ReplacementScrappy kind of Scrappy]] altogether.
** Not a lot of people like the Ants due to their sadistic and [[DisproportionateRetribution disproportionate]] torture against Sniffles just because he wants to eat what are part of his diet. Doesn't help that they always get off [[KarmaHoudini scot-free]].
* SomeAnvilsNeedToBeDropped: Youtube Copyright School makes it clear what happens when you upload copyrighted videos on Youtube.
* {{Squick}}
* TearJerker: [[TearJerker/HappyTreeFriends Read here]].
* UglyCute: Lumpy and [[DemotedToExtra Truffles]]
* UnpopularPopularCharacter: Evil Flippy/Fliqpy. While the other characters have a clearly good reason to fear him, he is perhaps the most popular character in the fandom.
* ViewerGenderConfusion: Is Flaky a boy or girl? Fans and creators usually go with girl. Although Graff sometimes {{troll}}s the fanbase regarding Flaky's gender because he likes seeing fans fight over it.
** Played for laughs in the episode ''Something Fishy'', where Flaky's shown trying to decide which bathroom to go in. We never do find out the answer. Although it's not really much of a mystery anymore since the creator has already stated a few times that she's a girl.
** Was confirmed to be a girl by the website's Twitter account on April 28, 2012.
** Cuddles often gets confused for a girl. It does not help that he has a high-pitched voice, wears pink bunny slippers, and is a light pastel yellow color. In episodes where he and Giggles are dating, YouTube commenters are shocked to discover Cuddles' true gender.
* TheWoobie: Depending on your tastes, everyone, but the most prominent being Flaky, who - unlike her sometimes blissfully unaware friends - responds with the appropriate amount of fear to the messes she ends up in. Runners up would be Toothy for his tendency to cry and Sniffles (and to a lesser extent, Petunia) for their often exceptionally [[CruelAndUnusualDeath brutal and prolonged deaths]].
** JerkassWoobie: Sniffles. Yes, he's trying to eat the ants, but that doesn't justify how much cold-blooded torture he suffers from them.
** Even the AxCrazy Flippy gets his moments when he realizes that he committed his violence against his own friends.
* WhatAnIdiot: [[WhatAnIdiot/HappyTreeFriends Has its own page]].
* WhatDoYouMeanItsNotForKids: The videos start out fine... until the middle bordering on end.