History DidntThinkThisThrough / WesternAnimation

-->'''Frylock:''' I give you the ultimate in military hardware. Complete with laser cannon, indestructible titanium exoskeleton, and motion-activated plasma pulse rifles.\\

* In ''WesternAnimation/TheAngryBeavers'' episode "Kreature Komfort", Norb and Dag's cousin is a life action beaver who behaves like a regular beaver. Norb is convince that he and Dag should live like their cousin and they destroyed their dam, got rid of their things and create a new dam that is like their cousin's. While Dag handles living it "wild", Norb then realizes living "wild" means he no longer have the things he needs and wants like the bathroom, beds, hair products, etc.

** In one sketch, the mayor's assistant of Des Moines, Iowa, hires Godzilla to destroy seaside national landmarks (like the Statue of Liberty and the Hollywood sign) so that Des Moines will get more tourists. When Godzilla receives his payment, he realizes he can't cash the check because he's a giant monster.

** In "[[Recap/TheSimpsonsS4E20WhackingDay Whacking Day]]", Apu holds a Quik-E-Mart promotion for the eponymous holiday by promising a free Squishee for the first person to whack the snake hidden somewhere in the store. This inevitably leads to massive amounts of property destruction and damaged merchandise.

** In "[[Recap/TheSimpsonsS5E17BartGetsAnElephant Bart Gets an Elephant]]", [[ExactlyWhatItSaysOnTheTin Bart gets a pet elephant]] when a radio contest offers one as a gag prize, providing two examples in one. The radio show never considered what would happen if someone actually did choose the gag prize and don't have an elephant to give him, and when they finally do find one, the family is completely unprepared to actually take care of an elephant.

*** In addition, what would have happened if Zaheer had killed Korra [[while in the Avatar State, ending the cycle. Would that mean that Ravaa dies too? In that case, humanity will be wiped out at the next Harmonic Convergence with no one to stop Vaatu.]]

*** Also, despite spending a lot of time trying to look convincing as a disabled person, he never thought ''once'' thought to ask himself ''how'' he's disabled. When he's asked what his disability is, both he and his mother are completely at as loss for words, and the ruse is almost busted.

* ''WesternAnimation/BlazeAndTheMonsterMachines'': Crusher and his cheating. All of his schemes to stop Blaze will always have a minor flaw in them that allows Blaze to drive straight past them and get back on track. For example, when he blocked Blaze's way with giant pipes, he didn't realise that Blaze could just drive right through them, selecting the one that's big enough for him to fit through. And when he sent space bighorns to stop him, he forgot that Blaze could just use his thrust to steer around them. The biggest example would be in "Power Tires", since no matter what Crusher did, he seemed to forget that Blaze could use the titular tires to turn into something to get right past the cheat -- to drive across the proper surface, to get through a slot in the gates on the walls and ceiling, and even to drive ''right through lava'' to the finish.

** In the Season 5 finale "The Cutie Remark", Starlight Glimmer concocts a revenge plan against Twilight by [[spoiler:traveling to the past where Rainbow Dash preformed her Sonic Rainboom and stops her in one form or another to keep the rest of the Mane 6 from becoming inspired and receiving their cutie marks at the same time, thus preventing them from coming to Ponyville later in life and forming their friendship. That's what Starlight pretty much wanted with the endgame of her plan. However, she didn't take into account ButterflyOfDoom. In the original timeline, the Mane Six had been integral to the defeat of several major threats to Equestria. Them not becoming the Elements of Harmony meant there was nobody around strong enough to stop the major villains of the series from running rampant, resulting in alternate timelines where Sombra, Queen Chrysalis, Nightmare Moon, Tirek, Discord, and even ''the Flim Flam Brothers'' take over Equestria with little to no opposition. When Twilight finally shows Starlight first-hand the result of her meddling in the past, Equestria has been reduced to nothing but a barren wasteland devoid of life. In addition, she attempts to destroy the scroll with the spell on it to trap Twilight and Spike in the past forever, but if she were successful without Twilight showing her the way, ''she'' would've been trapped as well.]]

* ''[[WesternAnimation/BatmanTheAnimatedSeries The New Batman Adventures]]'' episode "[[Recap/TheNewBatmanAdventuresE7JokersMillions Joker's Millions]]" has the Joker getting an UnexpectedInheritance from a dead rival. [[spoiler:Except that most of it was fake as laid out by King Barlowe in a VideoWill. Joker should have examined the money ''well before'' splurging on it. Being the SoreLoser that he is, Joker shoots the SpitefulWill in anger, not wanting to get jailed for tax evasion or become Gotham's ButtMonkey by admitting that a dead man conned him]].

* ''WesternAnimation/BobsBurgers'': In "Flat Top O The Morning To Ya", Jules wants to steal his flattop grill that's being auctioned off by the bank, but his plan involves waiting until the auctioneer is busy and just taking it in front of the all the other auction attendees. Even if he did have a good plan to get the grill out of the restaurant, he wouldn't be able to take it home because it won't fit in his tiny car.

* ''WesternAnimation/StarTrekLowerDecks'': In "[[Recap/StarTrekLowerDecksS1E10NoSmallParts No Small Parts]]", Peanut Hamper teleports herself off the ship while it's under attack -- but doesn't think of setting a specific destination, leaving her stranded in deep space once the battle is over.

** "[[Recap/TheSimpsonsS4E3HomerTheHeretic Homer The Heretic]]" has a prime example as the episode opens in the middle of a roaring blizzard. It appears that Homer is the sensible one who chooses to stay home that day. Meanwhile, Marge and the kids go to church and it is miserable as hell. First, the sermon is super long, then the doors are frozen shut to the point that Groundskeeper Willie needs to use a blowtorch to defrost them, and Marge and the kids need to walk home because the car wouldn't start.

** In "[[Recap/TheSimpsonsS9E17LisaTheSimpson Lisa the Simpson]]", Homer gathers together all the relatives he can find to try to prove to Lisa that Grandpa's "Simpson gene" theory is absurd. Unfortunately, his plan only proves the opposite, because all the male family members are bigger losers than he is. (As Bart tells him, "You probably should have ''researched'' this first, eh Dad?") Fortunately, [[AchievementsInIgnorance he inadvertently does manage to get Lisa her confidence back]], as the female family members are ''very'' successful and intelligent; as one of them explains to Lisa, the Simpson gene is in the Y chromosome.
** In "[[Recap/TheSimpsonsS9E22TrashOfTheTitans Trash of the Titans]]", Homer runs for the position of Springfield's sanitation commissioner, but after being elected, he ends up spending his entire year's budget in one month because he didn't realize how expensive his campaign promises would actually be. Then he figures he'll solve everything by just forcing the garbage collectors to work without pay -- until the mayor makes clear there's no way in hell they're going to stand for ''that''.
*** His solution to the budget crisis turns into this as well: [[spoiler: He earns more than enough by selling the right for other cities to dump their garbage in the old mines underneath Springfield. Unfortunately, he didn't take into account what would happen when the mines were ''full'', and ends up turning all of Springfield into a massive landfill to the point that the town has to relocate 5 miles up the road.]]

** "Inspection Detection" plays this more seriously than usual: while prepping for [[TheInspectorIsComing Fairy Inspection Day]], Timmy never tries to hide the things he wishes for, leading to him [[MistakenForThief getting accused of shoplifting]] when he can't explain where he got them. Later, he offers to plug himself into a lie detector to prove his innocence, but this falls apart when his parents ask him where he got the lie detector (because he can't tell them about Cosmo and Wanda or he'll lose them for good). Where does Timmy end up after this? In a PoliceLineup with Chester, AJ and [[TheBully Francis]][[note]]whom Timmy eventually proves to be the real shoplifter[[/note]].

** In the Season 5 finale "The Cutie Remark", Starlight Glimmer concocts a revenge plan against Twilight by [[spoiler:traveling to the past where Rainbow Dash preformed her Sonic Rainboom and stops her in one form or another to keep the rest of the Mane 6 from becoming inspired and receiving their cutie marks at the same time, thus preventing them from coming to Ponyville later in life and forming their friendship. That's what Starlight pretty much wanted with the endgame of her plan. However, she didn't take into account ForWantOfANail. In the original timeline, the Mane Six had been integral to the defeat of several major threats to Equestria. Them not becoming the Elements of Harmony meant there was nobody around strong enough to stop the major villains of the series from running rampant, resulting in alternate timelines where Sombra, Queen Chrysalis, Nightmare Moon, Tirek, Discord, and even ''the Flim Flam Brothers'' take over Equestria with little to no opposition. When Twilight finally shows Starlight first-hand the result of her meddling in the past, Equestria has been reduced to nothing but a barren wasteland devoid of life. In addition, she attempts to destroy the scroll with the spell on it to trap Twilight and Spike in the past forever, but if she were successful without Twilight showing her the way, ''she'' would've been trapped as well.]]

** In "Captain Craboo", while running from the police to protect the bears' titular pet crab, Panda ended up ''posting a'' '''''recent''''' ''photo of Craboo'' '''''online''''' without considering that the police might trace it to his phone to track them down. Apparently, [[SurprisinglyRealisticOutcome the police have access to online public photos to track down criminals]] and Panda [[NiceJobBreakingItHero still thought it was a good idea to do so]].

--->'''Zuko:''' I thought you thought this through.\\

--->'''Opal''': [[DeadpanSnarker Oh. Steam buns. My favorite.]] This will totally make me forget that you worked for Kuvira, the person who captured my family and is probably torturing them right now. So yeah, let's just sit down and have a great picnic because we're so in love!

* In ''WesternAnimation/{{Gargoyles}}'', Demona caused pretty much everything bad that happened in the backstory (and to her, specifically) with two stupid moves motivated by paranoia, FantasticRacism, and an inability to understand how humans capitalize on opportunities. She lost her first clan when she betrayed their castle to Viking invaders, thinking they'd stop at killing all the humans in the castle. Instead, they immediately started smashing gargoyles while they were asleep and helpless (and still present because unlike Demona, they still cared about the humans of Castle Wyvern and wished to protect them from things like viking attacks- [[EvilCannotComprehendGood something she never considered in her planning]]), because she and her co-conspirator had no way to ''stop'' them from doing that aside from really hoping they'd stick to their agreement. She later found a new clan and allied with Macbeth... only to overreact when one of his advisors suggested turning on her and betray him to Canmore. She never considered that Canmore hated her just as much as he hated Macbeth and would use the opening that she gave him to kill all of Demona's second clan.

*** Downpour's follow-up wasn't particularly well thought out, either. He rushes up to Aquaman and punches him. [[PunchPunchPunchUhOh Ineffectually]]. Aquaman responds with a backhand slap that takes Downpour out instantly.

** ''WesternAnimation/TheLoudHouse'': Lincoln Loud is the self-proclaimed "man with a plan" of the household who can come up with rather ingenious schemes to get what he wants out of his sisters. Unfortunately, being an 11-year-old, [[SurprisinglyRealisticOutcome he can forget that his sisters are capable of coming up with schemes, seeing through him, or "copying" his current scheme which screws him over]].

* ''WesternAnimation/WackyRaces'': Every single time DickDastardlyStopsToCheat. It's never enough that he is ALWAYS miles ahead of every other racer, he not only has to stop to lay a trap, but also stays behind to see the payoff, which ALWAYS puts him in last place. The most absurd example was the episode where he got stuck in the mud, and pulled out by a farmer with a donkey. He decides to buy the donkey, thinking that the farmer will no longer be able to pull the other racers out. Never mind that 1) almost half the racers have some gimmick that allows them to get out on their own, including a dragon that can dry it up completely, 2) the farmer OBVIOUSLY has several beasts of burden besides the one he sold and 3) Just what the heck will he do with a frickin' donkey?!

** In "Breakdown", Van Driessen decides to bring Beavis and Butt-Head into the mental hygiene center to show them what they ended up doing to [=McVicker=]. Of course, he didn't consult [=McVicker=] himself before doing so, and because of [[{{Jerkass}} who the two are]], [=McVicker=]'s mental health ends up getting ''worse'' to the point of requiring [[ElectroconvulsiveTherapyIsTorture electroshock therapy]].
** In "Drones", the drone soldier leaves his station so he can enjoy cake and ice cream with the rest of the crew. [[LethalNegligence He didn't lock the door before doing so]], resulting in Beavis and Butt-Head breaking in, gaining access to the drones, and wreaking havoc. Additionally, this grabs the attention of security, who [[LaserGuidedKarma arrest him on the spot]] after the duo had already left.