There are subjectives, and then there are these. While you may believe a work fits here, and you might be right, people tend to have rather vocal, differing opinions about this subject. Please keep these off of the work's page.
No Real Life examples including Executive Meddling. That's just asking for trouble.
No ALLCAPS, no bold, and no italics unless it's the title of a work. We are not yelling the DMoSs out loud.
Spider Fan 14: To me, the fact that Too Young basically had PB and Finn join up and bully the technical son of PB. It was painful to me when you add in the Fridge Horror of it all. And this may just be me, but Lemongrab seemed very mentally/physically impaired, and this makes me want to cry now, because I have Aspergers's Syndrome and know what it's like to be picked on for being considered awkward and freaky. Yes, he was being a Jerkass about the situation at hand, but there had to be better ways of dealing with him than how PB and Finn did it.
DeepC: The ending to the Adventure Time episode, "Wizard Battle". Now I absolutely love this series with a passion and the beginning and middle of this episode weren't all that bad. Now why do I loathe the ending so much? Well allow me to explain the beginning first. The whole episode starts of with Finn and Jake watching a battle amongst wizards. Everything is going great for them until they see the Ice King cheating so he could win the grand prize, which is a kiss on the lips from Princess Bubblegum. This motivates Finn to enter the Wizard Battle disguised as a wizard, stop the Ice King, and kiss Princess Bubblegum. While they fight, they come across a mediocre wizard named Abracadaniel, who wanted to fight, but does not want to kiss Princess Bubblegum. So Finn decides to help him win in order to save Princess Bubblegum. As the battle progresses, Abracadaniel gets even better with his magic and manages to defeat the Ice King. Now this sounds all fine and dandy, correct? Well here comes the Dethroning Moment of Suck; when Abracadaniel and Finn are the only ones left, Finn forfeits immediately, which meant that Abracadaniel won. With his newly developed confidence, Abracadaniel decides that he does want to kiss Princes Bubblegum after all. However, due to the "Power Of Love", Finn goes batshit crazy and screeches at Abracadaniel in a way that can be considered OOC, immature, and downright mean. This causes Abracadaniel to fall over, and even though it appears that the announcer is about to call him out for that, Finn still wins! Later, Finn is stressed out about hiding his feelings, now it's understandable that you're stressed about hiding your feelings, but what about having regrets for the way you screamed at Abracadaniel, pulverized his new-found confidence, and hurt his feelings?! Later, Finn reveals who he is in front of Princess Bubblegum. Now does he get any sort of scolding or punishment from this? Well he does get a slap on the face for cheating, but he still wins the prize of getting a kiss from Princess Bubblegum! Not only did Finn cheat, but he acted like a Jerkass and started staggering near Mary Sue territory. So I guess if I act like a screechy and jealous guy, I get what I want and there are hardly any consequences for it!
TheyCallMeFluffy: I like "Wizard Battle" and thought Abracadaniel was adorable for a bit, but God I hated how he was only Camp Gay (right down to his power being rainbows) and turned off to the thought of kissing PB when he was scared and wimpy. When he gains confidence and starts winning battles the campness goes, he starts "acting like a man" and suddenly looks forward to kissing PB. I like to think the writers were taking advantage of a stereotype to set up Finn's jealous turnaround when he'd previously helped Abracadaniel and they probably weren't actually advocating thinking of camp/gay men as just weak and in need of fixing (hopefully), but it's a huge Berserk Button and a gag I wish would just die already. I'd kind of hoped they were above playing it straight and I skip the part right before the power shriek when I rewatch it because it ruins the carefree mood Adventure Time usually has me in.
Filby: It mostly just bothered me that Finn and Jake just kinda forgot the wizard training they got back in the season 1 episode "Wizard", especially because their teacher and two other students from the same wizard school were there.
TornadoTomato: "You Made Me!" would have been a fantastic episode if it hadn't been a completely disgusting Karma Houdini for Lemongrab. This man acted like a monster for a whole episode, was a spoiled brat, tortured children, tried to electrocute his creator (who was being extremely kind to him...) and yet, he got exactly what he wanted, he was not punished or reprimanded for anything he did wrong. Even Princess Bubblegum justified all of his disgusting, torturous, cruel actions with "Oh, he's mentally disturbed, so he gets a free pass on just acting like a downright rotten person." Lemongrab justified all of his horrible behavior with "Princess Bubblegum made me this way, so this is how I'm supposed to act." I was one of the fans who felt sorry for Lemongrab during, and after, Too Young, but "You Made Me" made me lose almost all of the fondness I once had for this character. The moral of this story was this: "If you spend your life acting like a monster and hurting your family and those who care about and worry about you, you will get exactly what you want, and you will eventually find true love."
ading: For me, the DMOS for Adventure Time is the episode "His Hero." Finn and Jake meet Billy, who teaches them to be nonviolent in helping people. Throughout the episode, their attempts at nonviolent methods are portrayed as idiotic and just causing more trouble, and in the end they are forced to face the fact that the best way is to punch monsters in the face. So... the moral of the story is "nonviolence is never the answer?" What kind of a message is that?
Flygon Rider: My Dethroning Moment of Suck is the episode "Wizards Only, Fools", mostly concerning Bubblegum's characterization. Normally, she comes off as an overall sane, level-headed, kind, sometimes morally ambiguous ruler. However, this episode tosses that characterization out the window and instead turns her into a whiny, pigheaded, stubborn idiot who refuses to admit she's wrong, thus getting her friends thrown in prison and nearly being forced to kill one of them. And the whole "refuses to believe in magic" thing really rubbed me the wrong way. She lives in a world that's filled with magic (and frankly, needs it just to keep running), she's probably seen magic at work before, and she even used magic in "Five Short Graybles" to make the perfect loaf of bread, but now suddenly she's dismissing all of that? It'd be more understandable if she was the kind of person who wanted people to explore magic and see how it ticked instead of just accepting it at face value, but nope! She now believes that magic can simply be explained away. This wouldn't be so bad (if she considered magic a more advance form of science), but Peebs goes about it in the most pretentious, stuck-up way possible. In my opinion, this is Adventure Time's low point. The only thing that made up for some of it was the Princess showing off her parkour.
ghosttorrent: 'Jake Suit' not the episode but Finn's attitude he basically says he doesn't care that Jake gets hurt when he wears him and this is his brother and best friend and then he jumps down a volcano almost killing them.
Tropers/hurpdurp: "Too Old" for completely ruining Lemongrab's character by making him the most unlikable character in the entire show.
Tropers/Mswordx24: Ctrl+V that entire sentence, except replace "Lemongrab" (who I still think is a good character) with "Finn." They turned Finn into a totally selfish and horny teenager. He even lies to Jake by telling him that PB hates him so that it would be easier to flirt with her. Whatever happened to The Hero? The Conscience? The Paragon? The incorruptibly pure hero with an unbreakable moral code? The guy whose "deal" was slaying evil and not finding a girlfriend? Sorry, he's gone. Now we're left with the guy who would rather flirt with his rebound girl than save the lemon people and Lemonhope. In the end, he realizes that he shouldn't be flirting with her, but for the wrong reasons (because older people are "less fun inside"). Not learning a lesson is the cherry on the DMoS sundae, and Finn didn't learn his lesson. I severely hope this is just a major flaw the writers are intentionally giving him so that a giant character redemption pay-off will come later. But we all know it won't happen and Finn won't learn his lesson. He'll just suddenly be dating FP (again) as if nothing happened. Not one of Finn's proudest episodes.
Kashima Kitty: Concurring with the above about "Too Old". I have a pretty strong tolerance for distasteful things, but this episode of Adventure Time made me sick to my stomach. I expected the creators to learn their lesson about Lemongrab after "You Made Me" but it seems they're going out of their way to make him as unlikable as possible. The way he treated Lemonhope was bad enough, but what happened to the other Lemongrab was probably the worst thing I'd ever seen on this show.
fluffything: I agree wholeheartedly that this episode is a mess. However, my biggest issue is that this is yet again another "will they or won't they" dramatic tension episode between Finn and PB. Good gods almighty, can we just move on from this already? It is getting old. Look, I don't mind romance in children's cartoons. But, can we please not have it so forced in? Can we please go back to when Finn and Jake fought against the forces of evil and saved Ooo?
Vanguard1505: I'm with those about Finn on this one. This may be the writer's attempts to show Finn is going through puberty or something, but when such a phase completely overshadows who is meant to be The Paragon of the show, changing him from an Incorruptible Pure Pureness to some really horny teenager who is on the rebound, this only serves to be an awkward and painful distraction. Keep in mind, this was the same kid who refused to crush an ant because it was neutral, and here he is not giving a damn about a single citizen of Lemongrab's when they are obviously being tortured for the tyrant's amusement.
On The Hill: All the downright beautiful storytelling that was shot down with this episode. The Lemongrabs were loud, grating, impulsive, antisocial, and prone to making horrible decisions. They were also fiercely devoted to one another and loved their children deeply. And that's just fine, the narrative used to say. Some people are deeply troubled and need to be treaded around somewhat carefully, but that doesn't mean they're beyond help; and it certainly doesn't mean they can't love. Their hearts are fine...they're just like this. And this is where we end up? To hell with you, Adventure Time. There's Darker and Edgier and then there's just a trainwreck.
Hairy Leg Herpich: My biggest issue with this episode is how distasteful it was. There are just certain things that are too horrible to take lightly and I believe that child abuse is one of those things. This episode was so crammed full of blatantly violent child abuse and domestic violence that I wonder how survivors of these tragedies will deal with having been triggered by the episode. This episode was just disgusting.
Asger: I could gripe about Finn becoming a massive jackass in this episode, point out the rehashing of the same stupid shipping bullshit from two seasons ago, or Lemongrab's MASSIVE Character Derailment like others have pointed out already, but you know what I really hate about 'Too Old.'? They don't do anything about it. Does Finn grandly vow to liberate the lemonkids? Nope. Does PB say she's going to assemble an army to free the children at the mercy of a known cannibal? Nope (Seriously she has the likability of a hammerhead shark in an SS uniform). The others are just left to suffer and die under the derailed Lemongrab. Oh but it's okay, they saved the 'normal' lemon child.
Mighty Mewtron: "Earth and Water" for being too rushed. The ideas behind the episode (the real reason Flame Princess was locked up and the flashback, FP becoming obsessed with honesty, the Ice King temporarily living with Finn and Jake, etc) weren't too bad. However, a lot of the plot isn't utilized as well as it could have been. For example, at the end of the episode, Flame Princess takes over the Flame Kingdom (with the help of Cinnamon Bun), starting a rule based entirely on honesty. The problem with this is that we don't see the action of them doing this! Instead, we watch Finn and Princess Bubblegum saying random stuff and truths in order to access the Flame Kingdom (never mind that the "jokes" include Finn making a Your Mom joke and admitting to hitting a baby in the head with a snot bubble). The first part of the episode isn't too bad, and the idea of learning more of FP's past is intriguing (the baby FP was indeed adorable), but the ending was incredibly rushed and felt a little forced.
My Little Pingas: Not to mention that once again, PB is never called out on her crap. She may have only done it to protect everyone, but locking Flame Princess up without showing any sort of remorse or sympathy when she was a baby, then callously tricking her into being experimented on while claiming she was going to help her was just awful. What makes it worse is that she overheard what FP was talking about and what made her upset, but didn't even bother trying to talk to her about it or make her feel better. She should know damn well about FP's situation with Finn, since she basically put him through the same thing. She knows this now because he admitted it to her in "Burning Low", but even then she only cared about Flame Princess' unstable elemental matrix and never actually apologized to the boy himself! Hell, Jake called her out on it, but it was brushed off immediately! To be fair, she's actually a wonderful character with many good traits. But for Glob's sake, girl, own up to your mistakes.
The Ant 1: First off, I want to make clear that I'll continue watching this show no matter what, actually I pretty much do that with all the shows I watch. But I, for the love the God, cannot stand Red Starved. Why you may ask? Well I'll tell you. Jake closes off his friends' only means of exit, eats all of Marceline's red, nearly tried to eat her........ and nothing happens to him. He was twokinds of Houdinis.
heartauthor: My original D Mo S was "Another Five More Short Graybles," but I've found myself a new moment that I find more irritating. With all the ups and downs of Season Five, "Root Beer Guy" was actually a pretty refreshing episodes, and definitely one of the better ones I've seen in a while. But then, literally at the last second of the episode, I saw something that actually gave me Mood Whiplash. Earlier in the episode, it was acknowledged that Root Beer Guy was attempting to write a mystery novel, and he had been spending the last ten years trying to write it. At the end of the episode, RBG's life seems to have taken a turn for the better after becoming the head of the Banana Guards, and as we see him and his wife happily going for a walk outside...there's a split-second shot of RBG's typewriter in the trash. Now wait a minute! You mean to tell me that this project that was clearly very important to Root Beer Guy, to the point where it was interfering with the rest of his life, and he had been working on it for ten years, just literally ends up in the trash after one specific series of events? Like I said, yes, RBG's preoccupation with the story and solving the episode's mystery was affecting his real-life relationships (mainly with his wife), but that doesn't mean he shouldn't be allowed to have things he's passionate about. And if anything, at the end of the episode, RBG actually has a story! He could have written about his real-life adventure and let people enjoy that! While it's nice that RBG was able to move forward in his life, as someone who wishes to be able to write for a living, that last second of the episode was not a pleasant sight to see.