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Didn't Think This Through
aka: Did Not Think This Through
Somehow, I don't think you thought your cunning plan all the way through.

Mr. Krabs: Plankton! You knew I would never distrust a dollar!
Plankton: That's right, Krabs! Now hand over the Krabby Patty secret formula!
[Beat]
Mr. Krabs: Or what?
Plankton: I don't know. I never thought I'd get this far.
Mr. Krabs: Well then, allow me to suggest your next move.
[Mr. Krabs flushes Plankton down the toilet]

A situational trope. One character will develop a plan designed to solve a certain problem they're encountering. However, due to their failure to plan ahead, there is a massive gaping flaw in their plan that they, and also perhaps the audience, missed. As a result, they are now in a situation where, rather than winning, they are stuck with either a stalemate or an outright loss. As indicated by the page quote, this may occur because the character never thought that their plan would actually progress as far as it did in the first place.

A more comedic, simple version of Didn't See That Coming. See also And Then What?, when the flaw is not knowing what to do if the plan succeeds. If the person pointing this out is sufficiently annoyed, this can lead to What Were You Thinking?. Compare Step Three: Profit.


Examples!!

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     Anime and Manga 
  • Vegeta during the Saiyan battle in Dragon Ball Z after Gohan turned into a Oozaru. Escaping being crushed multiple times, he did seem proud of himself for a moment after cutting off the boy's tail, thus shrinking him to normal size. Given that, while Vegeta has taken a considerable beating fighting the various heroes, Gohan was the last one strong enough to present any kind of threat to him, it seems that he's won. Then comes the brief realization that Gohan is still semi-gigantic, not maintaining his place in the air and now falling towards him while semi-gigantic. All of this happens in about a second, leaving Vegeta no time to dodge. Not long after a crushed Vegeta is sitting in a crater, struggling to crawl to his ship.
  • Almost happens in Mahou Sensei Negima!. The cast are discussing ways to retrieve Asuna and the Great Grandmaster Key from the Big Bads, and get the idea to use Natsumi's artifact (which makes the enemy completely unable to sense your presence) to get close for an ambush. Unfortunately The Anti-Magic field coming from Asuna would make that plan useless. They almost go with the plan until Ako realizes the flaw. Cue Yue coming up with a workable solution, and a Crowning Moment of Awesome for everyone involved.
  • One Piece has the "Fake Straw Hat Pirates" based in Sabaody Archipelago after the time-skip. Since Monkey D. Luffy has attained even more infamy than ever before due to his part in the War at the Summit, one guy going by the name "Three Tongued" Demalo Black got the bright idea of posing as him and setting up a crew to pose as the Straw Hat Pirates, usually getting his way by relying on Luffy's fame to threaten people and recruit fearsome pirates into his crew. Unfortunately, around the time they were recruiting, the real Straw Hats came back, and it got steadily worse when they try to recruit a pair of Ax Crazy pirate captains who intend to kill the Straw Hats for more fame, and then Marines show up with Pacifistas, with a Marine Captain personally knocking out Demalo Black with his axe for trying to talk smack to him while pretending to be Luffy.
  • At points in both the first and second seasons of Strike Witches, Minna pulls a gun on Mio in order to try to stop her from getting herself killed in battle. Mio is quite aware of the flaw in this bluff, and it doesn't work either time.
  • Harumi Kiyama in A Certain Scientific Railgun plays this both ways. On the one hand, she's the only villain who realizes the damage her plot is causing, and actually creates a way to reverse the effects harmlessly once she's finished. On the other hand, she failed to account for what would happen if people randomly fall into a coma—such as if they're driving a car.

     Comic Books 
  • In the climax of Northwest Passage, Montclave reveals critical information to Simon in the hopes of permanently turning him against his father, Charles Lord. The information is that Simon's parentage is a Luke, I Might Be Your Father situation, since Montglave raped Simon's mother at the time of conception. Unsurprisingly, Simon takes a rather dim view of this knowledge and promptly blows Montglave's brains out.
  • Batman villain Warren "Great White Shark" White successfully plead insanity to escape embezzlement charges. He was sent to Arkham and wound up at the mercy of Gotham's worst psychopaths. Oops.
  • Doctor Octopus' plan in the Spider Man storyline Ends of the Earth. With the evil doc dying, Doc Ock plans to flash-fry the Earth, leaving approximately .08 percent of humanity to live on and remember him as the greatest monster that ever lived. However, Spidey points out a glaring flaw in this plan: they'll live. Brain dead, their brains flashfried, too. Doc Ock flips.
  • In one issue of the Batman The Brave And The Bold comic, Nightwing leads the Robins from other points in time (Jason Todd, Tim Drake, Stephanie Brown, Damian Wayne and Carrie Kelly) to one of Ra's Al Ghul's bases in order to use a Lazarus Pit to save Batman's life. When they encounter the League of Assassins, Damian leaps out, demanding that they stand down as is his birthright as an Al Ghul. The assassins look at each other, then charge at the Robins. Damian then remembers that he's not born yet.

     Fan Works 
  • All You Need Is Love: L's plan to expose Light as Kira hinges on Light trying to kill him but Light doesn't need to kill L. All he has to do is kill Watari and L's system collapses.
  • Voldemort Goes Back To School: in a state of panic, Voldemort creates massive wards on an abandoned classroom door that only Dumbledore or Grindelwald could hope to break in the hopes of avoiding further interactions with Harry and Draco. He realizes the gaping flaw in his plan when he begins to worry that McGonagall might get around his wards if she were to transfigure the door into something else and as it is Harry circumvents the door and all of his carefully laid warding altogether by dropping in through the window on his broomstick. And because he's so heavily warded the door he's essentially locked himself in.

     Film 
  • In Monty Python and the Holy Grail, when King Arthur's knights attempt to copy the Trojan Horse ploy with a giant wooden rabbit, none of them remember that they're supposed to get inside the rabbit until after it's been taken into the castle.
  • Lampshaded in ˇThree Amigos!. Dusty Bottoms has found Carmen in her place of imprisonment.
    Dusty: We have a plan.
    Carmen: What is it?
    Dusty: First, we break into El Guapo's fortress.
    Carmen: And that you've done. Now what?
    Dusty: Well, we really didn't expect the first part of the plan to work, so we have no further plan. Sometimes you can overplan these things.
  • Hermione says this very thing to Harry in the Harry Potter and the Prisoner of Azkaban movie, when she saves their past selves from the werewolf... by luring it over to their current selves.
  • In Aladdin, Jafar is defeated when Aladdin tricks him into wishing to become an all-powerful genie. Jafar either forgot or was not aware that genies in this setting are bound to a magic lamp and obliged to grant wishes by nature.
    Genie: It's all part and parcel of the whole Genie gig. PHENOMENAL COSMIC POWER! ... Itty-bitty living space.
  • Gil's plan to escape to the sea in Finding Nemo which succeeds past the audience's expectations only to run into a snag at the end.
  • A Strange Minds Think Alike style gag in Meet the Robinsons often said to Bowler Hat Guy. When a CEO, a frog and a tyrannosaurus rex think your evil plans need work, you aren't doing that well.
    "It's just, I have this big head, and little arms. I'm just not sure how well this plan was thought through!"
  • The Dark Knight
    Fox: Let me get this straight. You think that your client, one of the wealthiest, most influential men on the planet, is secretly a vigilante who spends his nights beating criminals to a pulp with his bare hands. And your plan is to blackmail this person? ... Good luck.
    Reese: *beat* ... Keep that...
  • The last line on Cloudy with a Chance of Meatballs, spoken by the Mayor, who is adrift at sea after eating the food boat he was escaping in.
  • In It's a Boy Girl Thing Woody (in Nell's body) decides to get her a reputation for being easy. So he decides to have her sleep with this really sleazy guy. The Didn't Think This Through example occurs just before the deed is to be done when Woody realises that he is actually going to be the one to experience the drunken sex with a guy. Also counts as an Oh Crap moment.
  • Done hilariously in Mystery Science Theater 3000 The Movie with Crow's escape plan:
    Crow: [as he causes the ship to suffer the wrath of space vacuum.] Oh, wow, this is confusing! Hey, Mike! Can you hand me my calculations? [paper flies into his mouth] Thank you! Oh, well, look at that: "Breach hull, all die!" Even had it underlined!
    • Then lampshaded with his explanation:
    Crow: Well, believe me, Mike, I calculated the odds of this succeeding against the odds I was doing something incredibly stupid and... I went ahead anyway.
  • In The Rundown, the sidekick's "Thunder and Lightning" attack never works. He becomes dumfounded when it does work and needs a moment to think up the next stage of the attack.
  • In The Avengers: "Okay, we've got its attention. Now what?"
  • In Pirates of the Caribbean Elizabeth stabs her host/captor captain Barbossa with a knife. It somehow slipped her mind, that even if she'd succeded, she would still be on a ship full of vicious pirates, whose captain she just killed, in the middle of the raging sea.
  • Recess Schools Out: Why did Prickly call the villain insane? Maybe because creating another ice age to end summer vacation forever would bring forth The End of the World as We Know It?
  • Kung Fu Panda 2: Po's plan to rescue the Furious Five where he admits he hadn't thought what he would do when he got close enough to do that. Mainly due to the fact he didn't expect to make it this far.
  • Sinbad: Legend of the Seven Seas: After braving many dangers, Sinbad and Marina finally make it to Tartarus and come face to face with Eris, the goddess of discord. The faces they make really show that they didn't have any plan whatsoever past that point.

     Literature 
  • The Hobbit: To enable the dwarves to escape from the Wood Elves, Bilbo secures them inside barrels so they can float away downriver. Unfortunately:
    It was just at this moment that Bilbo suddenly discovered the weak point in his plan... Of course he was not in a barrel himself, nor was there anyone to pack him in, even if there had been a chance!
    • Not that being packed into a barrel himself would have been an improvement. Getting out again wouldn't have been easy.
    • Not to mention the entire journey itself. The one weak spot in the Dwarves' scheme to get their gold is that Smaug is still sitting on it, and a baker's dozen of Dwarves are no much for the dragon, which is why Gandalf insisted that they rely on burglary. However, Bilbo, seeing the size of the horde he's supposed to steal, states that they should have brought an army of burglars, as there's only so much he can steal at once. Then Smaug smugly asks Bilbo how he's supposed to get his share back home. Only a series of lucky breaks (For a given definition of luck) keeps the adventure from going to waste.
  • Twice in Kitty Goes to Washington. Kitty had good reason to banish Elijah Smith back where he came from, but she didn't consider that this would mean the collection of vampires and lycanthropes under his control would then be out of control. Cue chase scene, followed by calling in backup to deal with the fallout. Later, Kitty tries to distract the guards on the first floor of a building by throwing rocks at the upstairs windows, hoping they'll investigate the crash. She realizes belatedly that if they instead put two and two together and look out on the street, she'll get caught red-handed. (Luckily, they're typical guards.)
  • In the Knight and Rogue Series, when told he must, in order to regain his legal rights, capture a murder suspect he released from jail and become his brother's steward, Michael sets out to bring the criminal to justice. Upon learning she's innocent he decides to not even bother with bringing her to trial, opting to be tattooed as a horible criminal instead. It's not until afterward that he realizes this will make people hate him by default and take advantage of him due to his being unable to go to the law for help. Bonus points for his father forcing the situation on him in the hopes that only his oldest son will hire Michael for a stable job if he's marked, as he apparently didn't notice that Michael spent the whole past year funding his adventures by stopping for the day in random towns and doing odd jobs for people who don't need to see the area on his arm where he gets marked.

     Live Action TV 
  • An episode of Blake's 7 plays this for laughs with its justification: when Vila asks Tarrant if he can actually dock their tiny ship into the Liberator that they have just reclaimed from Servalan, the following exchange occurs. (Incidentally, it's just a throwaway gag, since the very next scene has them already back on the Liberator safely.)
    Tarrant: I hadn't really considered it.
    Vila: What?
    Tarrant: I thought we'd be dead by now.
  • In Buffy the Vampire Slayer, Spike schemes to both break up the Scooby Gang and plant evidence to lead Buffy into a trap. It takes the Big Bad he's working for to point out that he's given Willow the evidence, and Willow won't be speaking to Buffy now.
  • In the Doctor Who episode "World War Three", the Slitheen get into 10 Downing Street, and chase the Ninth Doctor, Rose and Harriet Jones. The Doctor activates a defence mechanism that means there is 5 cm of thick metal between them and the Slitheen - or any way of escape.
    The Doctor: They'll never get in.
    Rose: But how do we get out?
    The Doctor: ... Ah.
  • In a Saved By The Bell episode, Zack has detention on the day of a trivia contest for a trip to Hawaii. He sends Screech in his place, who comes back to ask him a question. Mr. Belding explains only those in detention can talk to others there, so Screech purposely gets in trouble. When he sits down, Zack tells him the obvious problem with that plan.
  • On an episode of Seinfeld Kramer is at a department store when he decides to sell the clothes he's wearing to another customer. When he's left naked in the store's changing room with nothing to put on, he whimpers, "I didn't think it through!"
    • Kramer does this kind of stuff a LOT. Like betting that he would turn his apartment into a triple tiered deck.
  • In an episode of Top Gear, there was an amphibious car challenge, Hammond's car looked like a boat (with the steering wheel near the back) with an upper portion for the "girls in bikini to go," which he then noticed was so high up he couldn't see over while driving.
    • Then came Jeremy Clarkson's mobility scooter in Season 18, which was arranged so that the drive wheels had nothing actually pressing them against the ground.
    • And let's not forget series 15 episode 4 during the motorhome challenge. Clarkson designed a three story home on top of his car. It was barely able to clear overhead passes, and proved to be top-heavy, nearly tipping over several times on the road, and finally did during a very windy night.
    • None of their cop car vehicle-stopping devices proved well planned. Richard neglected to consider that cars can turn; James neglected to consider that cars have windscreen wipers; and Jeremy neglected to consider that a car's axle can handle only so much stress. The net result was that none of them managed to stop the Stig, adn as an additional bonus one of Jeremy's wheels ended up a substantial distance from his car.
  • The Big Bang Theory shows Leonard trying to slip out to meet his then-girlfriend and getting Sheldon to cover for him. Given that Sheldon cannot do this convincingly, Leonard almost immediately wonders why he didn't think this through.

     Music 
  • Have you heard the story of Bottleneck Bob? He tried to rob the train with cattle, but evidently forgot they needed to be corralled somehow: "The cattle ran all over the place / And there was Bob with the longest face"

     Newspaper Comics 
  • This Dilbert strip.
  • In one Calvin And Hobbes comic, Calvin creates the world's biggest snowball, and comments how he can't wait to throw it at somebody... that is until Hobbes asks him how he was going to pick it up.

     Video Games 
  • A frequent experience in Bomberman: Place bomb, walk into alley, realize alley is a dead end because of said bomb...
  • World of Warcraft:
    Draenei Male: Step one, we land the Exodar. Step three, we defeat Legion and go home. There is only one detail missing...
  • In Kingdom Hearts: Chain of Memories, Larxene is trying to cheer Namine up about the plan. Namine replies that they want part of Kairi to replace Kairi in Sora's memories so that he'll forget Kairi. Spot the flaw in this plan.
  • Something you can do in Smackdown vs Raw 2011 ladder matches. Have you and your partner both climb up a ladder. The opponents get up and realize they could just tip the ladder over. Cue doing just that.
  • Much of the "fun" in Dwarf Fortress comes from the player neglecting to think things through, such as forgetting to make a proper drainage system for your water (or magma!) devices, cooking all the fort's seeds so they have nothing to plant for crops, building a prosperous fort without regard for thieves, knocking the last support out from under your megaproject...
  • Name a Stealth Game, any Stealth Game, where a player gets impatient and decides to do something such as enter an unknown area without scouting ahead, shoot/stab someone in plain view, or run past a guy thinking "he won't see me if I'm fast about it". Load previous save and hopefully, learn from your mistake.
  • Pokémon Black 2 and White 2 has a fabulous example from Ghetsis, surprisingly. He orders Kyurem to attack the player character directly, rightly expecting this to force N into action to stop the attack, so he can steal N's legendary dragon and fuse it with Kyurem, which he controls. The thing he didn't take into account? N's actions did save the player character...
  • In Mass Effect Citadel Shepard is targeted by someone who wants to be Shepard. No, not Conrad, it turns out a plan to kill and replace Shepard by a Shepard clone. Turns out they're a Bad Boss, worse than pure renegade Shepard and a xenophobe. If the idea is to become the legend then they'd need to gain crew loyalty for the suicide mission, follow the paragon path Shepard had only to find out they're hosed upon learning Shepard's love interest is an alien.

     Web Comics 
  • An early strip of Sluggy Freelance starts off with Riff and Torg talking about how Zoe has a date with this guy she has a huge crush on. Riff then mentions that he is going to visit his ex-girlfriend Gwynn at her apartment, which she shares with Zoe. Torg is surprised that Riff going to see her alone like that. Riff insists that they're not alone, that Zoe will be there... at which point he realizes that even though he was aware of both of these pieces of information he only just now realized that they were related.
  • El Goonish Shive
    Female Immortal: I hate being invisible and intangible; it feels like cheating.
    Male Immortal: We can't exactly claim to be "everyday students" and expect to pass unnoticed in Elliot's house.
    Female Immortal: We could pretend to be burglars! That would make sense, right?
    Male Immortal: ... I don't think you've thought this through...
    • Abraham. Almost everything he ever did and we know about, starting from an enchantment Gone Horribly Wrong for which he became infamous. He (among other things) swore to destroy every creature created by his botched enchantment, the Dewitchery Diamond, on the assumption that the Diamond would be used against curses, thus creating monsters. He hadn't accounted for the Diamond being used to rid people of relatively harmless conditions such as Elliot's use of it to cure his Gender Bender problem by creating Ellen, an (mostly) innocent Opposite-Sex Clone. At one point, he claims he did everything he could to destroy the diamond, which failed. Within ten seconds, someone is able to think of something he didn't: Chuck it into a volcano. Maybe it wouldn't work, but c'mon, it didn't even occur to him? Even if that didn't destroy it, nobody's going to be able to use it for a good long while.
  • Webcomic/webgame Wicked Awesome Adventure points out how often this befalls adventurers in the course of escape and exploration.
    • J.E.T. enlists the help of a wounded and unwilling Candimp to disarm a trap.
    • Rhys solves a puzzle to access a new area of the Haunted House for exploration- opening a trap door, too.
  • Girl Genius got a few examples. Like this guy.
  • This appropriately titled Order of the Stick strip.
  • Fontes' Rants: Fontes uses the Life Note, a parody of the Death Note which creates a life form he writes in it, to create an Ax Crazy Marty Stu character. When he recovers after inevitably being knocked out;
    Fontes: ... I really shouldn't have made him able to summon firearms...
  • Spinnerette has a two groups trying to clone Adolf Hitler and Robert E Lee so they can lead their respective people again. Dr Universe, the scientist who promised to do the cloning only did so because he the plan would fail, because nobody would follow a clone of Adolf Hitler or Robert E Lee.
  • From Super Stupor, this strip, after Punchline explains why The Anarch's plan is really just Suicide by Superhero:
    The Anarch: I may have made a slight error in my calculations.
    Punchline: When you were adding up the numbers, did you remember to carry the stupid?
    The Anarch: Yes! ... no.
  • In Schlock Mercenary, the UNS tries to use a court case to trick a nearly all-powerful AI into admitting that he has been performing morally questionable actions (specifically, "disappearing" problematic people).
    Kerchak: And then what?
    Breya: I... haven't thought that far ahead.
    Kerchak: I'll bet you a bushel of pureed bananas he has.
  • In The Wotch, the Uricarn Demon killed all the other members of his species. He didn't think it through.
    Uricarn: I enjoy being your bit of controlled chaos. Beats just wandering aimlessly finding cheap thrills like I was doing after exterminating the rest of my kind... Which was kinda stupid in retrospect. Probably should have let myself grow up a bit before making that decision...*
  • In Commander Kitty, Nin Wah tries to turn herself over to the Triple-I by teleporting herself to one of their ships... while CK is busy shooting them down.
  • In Questionable Content, Angus, Marigold, and Faye get drunk together. Faye asks Marigold if she has ever dated anyone (she hasn't). She says that she think she has a chance with someone and looks at Angus as he returns to the couch. Faye, feeling incredibly awkward walks out and goes home. Thing is, Angus likes Faye (which Faye knows) and Faye may like Angus. Angus doesn't like Marigold like that, but she left them together drunk and alone. When Dora points out the obvious, Faye has the appropriate reaction.

     Web Original 
  • In The Salvation War, after the demonic general Abigor hears of the defeat of (most of) his cavalry attempting to charge a ridgeline with "cowardly mages throwing mage bolts, with mage-bars in the ground and silvery snakes in the ground that cut up demons and their steeds alike" (paraphrasing here), his plan for the second day of fighting is to extend his lines by thinning them — by the time he was done, an almost-fifteen-mile-long front! — so as to outflank and envelope the enemy, while ordering massed use of demonic bolt "fire" to suppress the mages. Too bad he didn't realize that he would only be able see a small portion of the battle at any one time, and thus would have to keep riding back and forth along the lines, until he was already on the front lines in the midst of the carnage, with multiple rockets headed his way... they missed him, but he immediately and correctly intuited that he had been personally targeted.
  • Kevin Murphy puts the exact phrase into the mouth of the Scott Ian-looking Geat who makes a spectacularly failed attempt to charge Grendel in the 2007 Beowulf RiffTrax.
  • In Dragon Ball Abridged Gohan suddenly realized mid sentence that his decision to challenge Recoome to a fight after Recoome had already wiped the floor with Vegeta, a much more powerful fighter, was a bad idea.
    Gohan: I'm not going to back down. I might be younger than you, smaller than you, weaker than you, and much less experienced, but I learned more about peach farming than yo-I think this was a horrible decision.
    Recoome: Recoome agrees.
  • Early in Yu Gi Oh The Abridged Series, Mokuba laments his poor foresight upon realising that using a Bedsheet Ladder generally only works if the sheet is long enough to reach the ground floor. Fortunately for him, he's a cartoon.
  • The Spoony One puts this in the mouth of the main villain of Highlander The Source when he gets the Quickening at the top of a tall tower.
  • The plan that Leeroy's raid group comes up with for taking on the Rookery in the Leeroy Jenkins Video ignores two key facts:
    1. Scattering the whelps of the Rookery only keeps them off you for a few seconds and will likely bring more to bear on you — you really want to hatch as few of them as possible. Fear rotation is rather pointless in the Rookery anyway due to the rate at which the eggs respawn.
    2. The paladin ability Divine Intervention does not allow a protected character to use any skills and is very much wasted on mages (who primarily rely on skills such as AOE attacks) and has the added "bonus" of killing the paladin who uses it, removing a character with the ability to tank and heal from the general fight.
  • Half of what Jay does. For example, breaking into Alex's home. He drops his flashlight, and then runs into the Operator.
  • Invoked Trope in Death Note: The Abridged Series (kpts4tv):
    Light: Wow, a book that drives people crazy when they touch it! (*touches the notebook*) Death Note? What is this like an advanced calculus notebook or something? I'm so gonna walk around and touch everyone with this and drive 'em... oh, right. I didn't think this one through.
  • Happens in the first episode of DSBT Insani T when Koden sends Killer to kick Bear, Snake, Duck, and Balloon out of his house.
    • Also in 'Beach Brawl' when Kerry impulsivley throws Shovel at frozen Cell, thinking that would shatter him.
    Bear: Even I saw that one coming a mile away.

     Western Animation 
  • In one episode of Justice League, Copperhead attempts to gain leverage for an escape by jumping onto Hawkgirl's back, positioning his poison fangs near her neck, and ordering her to fly him out. She flies up a few hundred feet and stops. When Copperhead demands to know why, she notes that his threat is no longer as effective, since if he bites her neck she'll fall to the ground and they'll both die. "Didn't think this through, did you?" After she touches down, Green Lantern congratulates her on the bluff; her reply is a deadpan "Who's bluffing?"
  • Legion Of Super Heroes: Alexis sics her personal robot on Superman, who immediately slices it apart with his heat vision.
  • Invader Zim:
    • Zim has this as a personality trait; as The Other Wiki once described him, "Zim has a crafty sort of intelligence, but he tends to think precisely one step ahead of his current problem". For instance, Zim builds a stasis-field device in one episode which subsequently explodes, but the fireball is slowed by the stasis field until it's expanding at less than walking pace. However, it will eventually grow to the point where it'll consume Zim's base along with the entire city. The Tallest might call back soon and Zim really doesn't want them seeing an embarrassing screw up like this (though they don't really give a crap). Basically Zim has to get rid of the explosion, do it in a way that doesn't destroy his base, and do it quickly. Zim's brilliant plan to handle this problem? Simple. He'll just cancel the stasis field under the assumption that once the field is canceled, the explosion will be gone forever. This true, but this will also annihilate his base and the whole city. Despite being warned by his computer, and even his Cloud Cuckoo Lander sidekick, that this is a really, really bad idea, he goes ahead with it. Hilarity Ensues.
    • The Tallest also seem to suffer from this, resulting in conquered planets being turned into massive parking lots because they didn't know what they'd do with the planet after conquering. They also ordered enslaved races to build weapons for them, resulting in the Megadoomer needing a massive extension cord and cloaking everything but the pilot and said extension cord.
  • Family Guy: In the episode "Blind Ambition", there is clip of one of Peter's (or both his) Siamese twin ancestors each fighting opposite sides in the Civil War. The one who fought for the Union killed the other, who continued decomposing until he was a skeleton. "Nope... Did not think that one through," he said to a bartender who asked about the skeleton.
  • American Dad: The episode where Francine gets poorly-aimed Laser-Guided Amnesia, she runs off to Burning Man with Hayley's boyfriend. This exchange happens when Stan meets up with Hayley at Burning Man:
    Hayley: Mom stole my boyfriend!
    Stan: Your boyfriend stole my wife! Let's get back at them by dating each other! Wait a minute. Daddy didn't think that through.
  • Sponge Bob Square Pants: For a protozoan who goes to college and makes highly elaborate plots to get the Krabby Patty formula, Plankton can be a little slow when it comes to thinking ahead of his goals. For example, a robot made to look like a customer enters the Krusty Krab. Eugene Krabs, smelling an obvious trap, takes the place of the register. To his astonishment, the robot just asks for coral bits and even pays him money after it's given its order. Suddenly, Plankton, who somehow managed to hide inside the dollar bill (even for someone his size, there must have been some hammerspace in there), pops out and gloatingly orders Krabs to hand him the secret formula. Krab's response: "Or what?" Plankton: "I don't know. I never thought I'd get this far." Krabs: "Well then, allow me to suggest your next move" (flushes him down the toilet).
  • The Jimmy Two Shoes episode "The Big Drip" has Lucius destroying every washroom in Miseryville to torment Jimmy during a Potty Emergency... including his own.
    • And pretty much any plan Jimmy and Beezy devise (alone or together) without outside input.
  • Avatar The Last Airbender: Zuko, such as when he kidnaps Aang in the North Pole (alone, in a blizzard, with the closest fire nation ships all being hostile) in the first season finale or when he tried to steal Appa from Lake Laogai. He gets better, eventually.
    • Zuko's so bad with it that it's contagious.
    Zuko: I thought you thought this through.
    Sokka: I thought you told me it's okay not to think everything through!
    Zuko: Maybe not everything, but this is kind of important.
    • In The Legend of Korra, this is a notable character trait of Korra's for most of the first season's run. And Amon takes advantage of this at every turn.
  • The Bugs Bunny cartoon Jack Wabbit And The Beanstalk has Bugs challenging the giant to a duel. "Take twenty paces, toin, and fire. Got that, shorty?" As the giant takes his paces, he disappears into the horizon and Bugs thinks he's outsmarted the giant. But then the giant reappears over the other horizon—the twenty paces were enough to circumnavigate all the way back.
  • From the "Dog Of Death" episode of The Simpsons:
    Homer: I've figured out an alternative to giving up my beer. Basically, we become a family of traveling acrobats!
    Marge: ... I don't think you thought this through.
  • From the "Her Parents" episode of Adventure Time
    Jake: Nah... That could never happen.
    Finn: You didn't think this through enough. IT COULD HAPPEN!
  • Turned into a Running Gag with Mojo Jojo in The Powerpuff Girls. To the point where when a spree of robberies occurred in Townsville, the girls quickly ruled him out as a suspect because it was too well thought out.
  • Wacky Races - Every single time Dick Dastardly Stops to Cheat. 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 The Avengers: Earth's Mightiest Heroes Absorbing Man occasionally absorbs things he really shouldn't. When fighting the Hulk as metal, he absorbs rock. The Hulk promptly breaks his arms off. The metal form might not have let him win, but was at least keeping him in one piece. Much later he absorbs Mjolnir, and Thor reveals that he can now control Absorbing Man just like he does Mjolnir, and starts hitting people with him.
  • In an episode of Rugrats the babies imagine shrinking down and traveling into Chuckie's stomach to take out a watermelon seed he accidentally swallowed. Angelica however reveals her intention to actually water the seed so it grows and causes Chuckie to explode. She succeeds and gloats evilly, until Tommy points out it's going to explode with her inside it.
  • In the Thundercats 2011 episode "The Forest of Magi Oar," the young hero Lion-O begins to recognize and lampshade his own lack of forethought. When he uses his gauntlet's grappling hook to latch onto a retreating Giant Flyer Viragor, Lion-O has just enough time to realize "maybe this is a bad idea" before he gets violently dragged along for the ride. Shortly thereafter, he faces down the charging Big Badass Bird of Prey after tossing his weapons aside. Again, he muses, "probably another bad idea," seconds before it grabs him in its talons. The latter gamble does manage to pay off, since, on a hunch Lion-O is betting Viragor proves Dark Is Not Evil.
  • In an Animaniacs Pinky And The Brain short Brain devises a plan to infiltrate Fort Knox and make off with all of its gold. The duo actually succeed in getting into the vault, but Brain forgot about them having to carry the gold, and since they're mice you can see where this is going.
  • In one episode of DuckTales, the Beagle Boys manage to get inside the Money Bin and trap Scrooge outside. When they call Glomgold to gloat, Glomgold points out that they have no way to transport the money ("What are you gonna do? Carry it in your wallets!?") and that Scrooge will have an army ready to take his Bin back.
  • In the South Park episode "Summer Sucks", after fireworks are banned, the Mayor attempts to glorify the use of ash snakes with a giant sized one for the Fourth Of July. It works and creates an enormous display of ash... and keeps going... and going. The now somewhat nervous Mayor asks the creator when it will stop, he explains that he has no idea since he never made one this big, leading him to quote this trope to the exasperated Mayor.
  • In Dexters Laboratory, this was very often one of Dexter's fatal flaws despite being a genius. Justified seeing that he was only about eight years old, and so he was bound to make mistakes.

     Real Life 
  • Most people make this mistake in everyday situations when they know the results of a missed variable can be ignored or worked around (e.g. if you reach for a tool that you forgot to prepare, just get up and retrieve it). Bad things tend to happen only when too many of such mistakes line up and cause a chain reaction.
  • A rather better military example would be Project Pluto, the supersonic low-altitude nuclear-powered nuclear ramjet missile developed by the U.S. military (the fact that they seriously considered building that thing counts already). Project Pluto's real problem was that it was overtaken by ICBMs during its development. Aside from the difficulty in test firing it (which wasn't as crippling as it sounds, it might be an environmental disaster on wings, but this is during an age predating the green movement, meaning that a bit of isolated water in the Pacific would do), the project had a serious chance to turn out as a practical Nuke 'em to hell option. Its just that ICBMs are more practical, being faster, cheaper and harder to intercept; they may not irradiate such vast swaths of enemy land by merely flying over them, but once the major cities are gone, that hardly matters anyway.
  • Australia's problem with the Cane toad. Because of Cane beetles destroying sugar cane crops, a bunch of Cane toads were imported to get rid of them. Only problem was that the toads couldn't even jump that high, so they ended up being unable to eat the beetles that were on the tall stalks... which caused them to eat everything else. And then they started infesting and taking over... combined with how they're highly poisonous and can poison any animal that eats them. Yeah, that solution was not exactly the best thought out.
    • It doesn't help that cane beetles and cane toads aren't active at the same time of day, so they don't ever even interact.
  • Another Australian one: The Murray River was destroyed in an attempt to bring over European farming techniques without realising that Australian soil was ill-suited to the endeavour. Clearing of trees for land led to salt buildup, which poisoned the water and ended up clogging the river.
  • And yet another: Despite already knowing that Australia is the driest continent in the world (seriously, check out the sheer amount of desert there is), no government there had a sufficient water-saving plan aside from the restrictions. This came back to bite them in the arse when the country was engulfed in an extreme drought, the likes of which had not been seen for the past several centuries. Of course, now they have the exact opposite problem...
  • The Lake Peigneur disaster was caused by someone drilling for oil through a lake into a salt mine. Admittedly, they knew not to drill through the salt mine and just messed up when they were figuring out where to drill, but still.
  • During WW 2, the Russians strapped explosives to dogs trained to run at tanks. Once the tank ran over the dog, the pressure-activated explosives would total the tank. The only problem? They trained the dogs using Russian tanks made to look like German ones. But Russian tanks used diesel engines; German tank engines used petrol. When in doubt, they went with what smelled familiar. Hoist by their own petard indeed.
    • The Dog Bites Back. Though this is RUSSIA in WW 2, the only reason they weren't using human suicide bombers was because dogs are quicker and smaller.
    • It killed half the canines in southeastern Russia, which made herding and various other jobs a dog would do even more difficult. Eventually there were breeding programs, but for a couple years dogs seemed to be extinct in Moscow.
  • A salesman showing reverse searching (which was a search for what people were searching the internet for) decided he would use "toys" as the keyword. Apparently, he didn't realize until too late what kind of toys people search the internet for from the privacy of their own homes...
    • Considering Rule 34, it would have been smarter to just skip the demonstration altogether.
  • Quaker Oats buying Snapple for $1.7 billion. Unlike every other drink in Quaker's line-up (including, for instance, Gatorade), Snapple has to be refrigerated. It was only after the deal had gone through that Quaker realized that it had a shipping fleet of exactly zero refrigerated vehicles. Refrigerated distribution outlets soon realized this as well, and colluded on a high price to deliver the Snapple. Eventually, Quaker sold it for $300 million dollars to another company, long after Snapple's trendiness had faded.
  • Nazi Germany had a problem: with the US being officially neutral but unofficially supporting the Allied war effort, German u-boats could not be used to their full effectiveness in the Atlantic. Japan attacks the United States and war breaks out, and Hitler thinks this solves his problem as he can declare war on the US because Japan is an ally, and thus finally give his naval forces the freedom they need to effectively cut off Great Britain. Of course, this also means the single largest economic and manufacturing power on the planet now doesn't have to pretend to play nice either.
  • Criminals. This tends to happen to them a lot. In example:
    • A few would-be ATM thieves in South Africa decide to use explosives to open up an ATM. Once the bomb goes off, the money would be theirs for the taking! But, somewhere in thinking how awesome it would be to blow up an ATM with a bomb, they forgot to make an important consideration. Namely; paper money tends to burn. Hilarity Ensues.
    • There have been several cases of people walking into a business, filling out a job application with their real name, address, etc., and then holding the place up at gunpoint. Of course, it doesn't take too long for the police to find them.
    • One example was a bank robber who decided to rob a bank, that was across from the FBI headquarters, ON PAY DAY. Oops.
    • Another robber went up to a bank with a stick-up note... written on the bottom of his pay slip, which had his name, address, postal code, and telephone number on it. Of course, he doesn't compare to the robber who held up the bank coming right from his work at a construction site... still wearing his hard hat, which had his name on it. Neither of them are quite as stupid as the criminals who decided to draw masks on their faces with black marker.
    • Another robber had the absolutely ''brilliant'' idea to rob a gun shop. He found out the hard way that the guns are not for display purposes only. Not only did he rob a gun shop, but he walked past a marked police cruiser to get there. They say he was so surprised at seeing a cop that he opened fire. Six customers and the cop drew and 4 of them returned fire. He did not survive.
    • Then there was the time a robber tried to rob a shop, whilst wearing a crash helmet. A crash helmet that had his name emblazoned across the front.
  • Official policy of communist states to deal with disaster? Issue a nationwide bulletin that absolutely nothing has happened, and everything is fine, and censor any attempt to bring it to the public's attention. Well the public still became aware of it, but by that time, it was too late to do anything about it.
    • Biggest example: The Chernobyl Disaster. It was one of many things that lead to The Great Politics Mess-Up.
    • The resultant policy of Glasnost the Soviet Union enacted after the disaster is another example, but in the reverse. Turns out, when you can't even feed your own people, enacting a policy of total transparency with the press is not such a good idea after all.
  • The Mongol Invasion of Japan. Kublai Khan was in such a rush that he ordered the Chinese boat builders to make a huge fleet (a fleet second only to the invasion fleet that launched the Invasion of Normandy) within a single year. The Chinese laborers had to supplement the sea-worthy boats with river boats that had no keel, and thus were unworthy for sea travel. Bad enough when you are crossing an ocean, even worse when that ocean is prone to violent storms and typhoons. The now-famous kamikaze led to the single greatest loss of life in a disaster at sea in recorded history, with many of the over 3,000 ships sinking with most of their crew.
  • Italian general Pietro Badoglio in World War I expected the Austrians to possibly break through in the Caporetto sector, and had prepared an ambush with tons of artillery to annihilate the Austrian troops, then gave the artillery commander orders to not open fire unless he ordered him to, and returned to his headquarters to wait for the enemy offensive. When the Austrians did break through at Caporetto, he gave the order... only to discover that the Austrian preparatory shelling had interrupted the phone lines, the noises of the battle covered his sound-based signals, and the heliograph's signals were blocked by the fog. The Austrians realized there was a trap only when they saw the guns and the artillery commander surrendered to them, and since then in Italian 'Caporetto' is synonymous with 'utter and complete defeat'.
  • In 2011, a twenty-year-old woman came forward claiming to have been knocked up in 2010 by the then-sixteen-year-old Justin Bieber, and attempted to sue him for compensation. If she lost the case, she could be tried for fraud. If she had won the case, she would have been admitting to statutory rape. Baby, baby, baby, no.
  • This kid didn't quite realise that a locked padlock that he tried to pinch couldn't be, well, unlocked without a key!
  • Not Always Working:
    "To get to the colour blind test, just go outside and follow the green signs until you see a red building. Go through the purple doors, just past the blue ones."

Deus Exit MachinaStupidity TropesDitch The Bodyguards

alternative title(s): Did Not Think This Through; ptitletxhiqoj 2
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