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A character is (sometimes, quite specifically) warned of the horrible things that can happen if they do Action A. They blow off the warnings. After the terrible things happen, The Cassandra then informs them they have no-one to blame but themselves.
That statement, whether or not it uses the Stock Phrase "I Warned You" or "I Told You So" is this trope, provided the warning took place. If it did not, due to Poor Communication Kills, Not Now, Kiddo, or the warning not reaching its intended recipient, but the Stock Phrase is dropped anyway, the trope has been inverted, not played straight.
Generally -- though not always -- Played for Drama if played straight. If Played for Laughs, expect The Cassandra to be an exaggeratively smug or jerkish in using this trope (a likely consistent trait that lent to no one listening to them in the first place) and at least one indignant victim to try and silence them (usually by yelling a bitter "Oh Shut Up!").
- In Bone, Lucius warns the regulars at his tavern not to be taken in by Phoney Bone's Mystery Cow scam. They don't listen to him (or rather, they do, but Phoney tricks them all over again), so after the race ends and the con is exposed, the townsfolk want to lynch Phoney, but are held off by Lucius, who later points out that they have no-one else to blame but themselves for being swindled;
Lucius: But I warned ya! I told ya you were bein' played for a buncha saps, but ya didn't listen to me, did ja? Huh? Did ja? that's right! An' when Gran'ma Ben won that race, I was the only one who bet on her! Me an' Gran'ma coulda split that pot, but noooooo... We felt sorry for ya! All bets were off an' we let ya have yer livestock back! All told, I'd say you girls got off easy!
- In their college years, Reed Richards warned Victor von Doom that he made a few miscalculations that would cause his new invention to malfunction. Victor didn't listen and the machine blew up in his face. Literally. Victor's oh-so-reasonable response was to drop out of college, build a suit of Powered Armor, take over a country, and spend the rest of his life trying to ruin the lives of Reed Richards and his loved ones.
- In the Bleach fic Hogyoku Ex Machina, when Ishida warns Mayuri (not very hard, mind you) that it wouldn't be a good idea to have Ichigo attempt to place his reiatsu into a rare and valuable crystal because he's clumsy, Mayuri blows him off. Then Ichigo (having a massive amount of reiatsu and no control over it, hence “clumsy”) makes the crystal explode.
Mayuri: DO YOU KNOW HOW MUCH THAT COST?
Ishida: I told you so.
Films -- Live-Action
- The Book of Eli: In the first fifteen minutes of the movie, when the raider shoves Eli.
Eli: Touch me with that hand again and you're not getting it back.
Bruce: We all know how much you like to say "I told you so."
Alfred: On that day, Master Wayne, even I won't want to. Probably.
- And its Ironic Echo...
Bruce: Today you get to say "I told you so."
Alfred: Today I don't want to. (they start to walk out) But I did bloody tell you.
- Ghostbusters: Walter Peck orders a Con Edison worker to shut off power to the Ecto-containment grid despite warnings from Egon Spengler, Peter Venkman, and the Con Ed worker.
Venkman: If you shut that thing off, we won't be held responsible.
Peck: On the contrary, you will be held completely responsible. (to Con Ed worker) Shut it off.
Venkman: Don't shut it off. I'm warning you.
Con-Ed Man: I never seen anything like this before. I don't know...
Peck: I'm not interested in your opinion. Just shut it off.
(later, at the Mayor's office)
Stantz: Everything was fine with the system, until the power grid was shut off by dickless here.
Grandfather: With Mogwai, comes much responsibility. I cannot sell him at any price.
- Randall Peltzer acquires a mogwai anyway. Warnings about them are ignored and the gremlins run wild.
Grandfather: I warned you. With mogwai comes much responsibility. But you didn't listen.
- Ironically, the warnings were heeded. The mistake came from trusting an analog clock that turned out to be stopped because the evil Mogwai (later Gremlin) Spike had sabotaged it. The "do not get them wet" rule being broken was an accident.
- Men in Black: After K shoots Jeebs:
K: I warned him. You warned him.
- Monty Python and The Holy Grail: Tim the Enchanter warns King Arthur about the deadly Rabbit of Caerbannog but Arthur doesn't believe him. During the battle three of Arthur's knights are killed by the Rabbit, including one who has his throat ripped out.
Tim: I warned you! I warned you, but did you listen to me? Oh no, you knew it all, didn't you? Oh, it's just a harmless little bunny, isn't it?
- The Goonies: After realizing they're dealing with the wanted Fratelli gang.
Chunk: See, you guys! You never listen to me! I said there was gonna be trouble, but you didn't listen to me! You guys are crazy! You know, you guys are self-destructive! There's a funny farm that has your names written all over it!
- I Robot has "Somehow, 'I told you so' doesn't quite say it." when the robots start rebelling. Or words to that effect.
- In the first of The Mummy Trilogy remake when the Americans find Imhotep's tomb and one of them reads the warning etched on it. Their guide (and Dirty Coward) Beni runs off yelling to beware the curse. They don't believe him thinking he's being superstitious. Of course Imhotep gets loose and starts draining the life of those that opened the casket. One of the Americans manages to escape but with his eyes and tongue taken. As the surviving American rests at a hotel, Beni (now working for Imhotep) tricks said American into meeting with a healer who is really Imhotep in disguise. Before the American is drained, Beni tells him that he did warn them not to open the tomb.
- In Codex Alera, thanks to being Mindlink Mates, Tavi and Kitai preempt the other saying this because they can feel the smug amusement on multiple occasions.
- Twice, pretty much word for word, in Darkness Visible. The second time is a callback to the first.
Lewis: You will see me in this office again, Wilson, even if it is only for sufficient time to say “I warned you” before the world ends!
Lewis: Very well then, Wilson, stay and gibber in your precious office,’ I told him crossly. ‘But if we fail, consider this as me saying “I bloody warned you!
- Polly to Digory in The Magicians Nephew after he falls for the Shmuck Bait that wakes up the White Witch. In Prince Caspian, when it turns out that Lucy was right about the route the group should have taken and they'll have to go back the way they came, Peter congratulates her on pointing this out without saying "I told you so."
- Rayford Steele, near the end of Glorious Appearing in the Left Behind book series, tells his wife Irene, who has been warning him about Jesus' Second Coming and the Rapture, that she is entitled to "one cosmic I-told-you-so".
- Babylon 5, episode "Severed Dreams":
Delenn: (addressing the Grey Council) Three years. For three years I warned you this day was coming, but you would not listen. Pride, you said, presumption. And now the Shadows are on the move. The Centauri and the younger worlds are at war, the Narns have fallen, even the Humans are fighting one another.
- Doctor Who
- From the episode "School Reunion":
Mickey Smith: You see, what's impressive is we met her nearly an hour ago and I still haven't said "I told you so" yet.
Rose Tyler: I'm not listening to this.
Mickey Smith: Though I have prepared a little "I was right" dance which I can show you later.
- The Doctor also plays this line for drama all the time. Especially Ten. It goes with his 'I'm giving you a chance' mantra, which the Monster of the Week almost invariably ignores.
- He says it verbatim in "Runaway Bride" after blowing up and drowning the last of the Racnoss.
The Doctor: I warned you. You did this.
- In Coach Hayden go to say this over and over after his wiser wife Christine finally makes a mistake and gets arrested after a rowdy bachelorette party by not listening to him.
- In the Stargate SG-1 episode "2010", Jack O'Neill is very much in "I told you so" mode from the beginning; if they had listened to his warnings about the Aschen ten years ago, they wouldn't need to Set Right What Once Went Wrong now by using the Stargate as a time machine.
- In the musical Woman of the Year, two characters sing a song about how great it is to be able to say "I Told You So."
- In LA Noire, Cole is planning on investigating Elysian Fields which McKelty, the captain of the Arson desk, finds that unacceptable.
Cole: We're about to visit Elysian Fields Development.
McKelty: You're about to do what? Leland Monroe, he's a personal friend of the Mayor and the Chief. Are you out of your mind?! I'm warning you, Phelps.
- Heavy Rain would have this case when Norman is planning of accusing Blake of being the Origami Killer.
Norman: I think you're the killer, Carter.
Blake: Watch your fucking mouth, Norman. You're about to make the biggest mistake of your life.
- In Assassin's Creed Brotherhood, Claudia's Jerk Ass (former) boyfriend Ducio (who Ezio beat the crap out of for abusing her) makes a return as a ship captain that got his hands on 3 of Da Vinci's paintings that Ezio needs. Ducio, who has no idea that Ezio has become a master Assassin, begins mouthing off, thinking that his crew will back him up. Ezio drops a rather ominous "I am warning you", and Ducio, not taking the hint, begins trashing Claudia. Ezio decks Ducio with a punch to the face and proceeds to mop the floor with him and his crew. Much fun is had for the player.
- Sweet Bro and Hella Jeff: "I warned you about stairs bro!!!! I told you dog!"
- In Impure Blood, after the fight. All the more annoying in that his warning had consisted of Vagueness Is Coming.
- Defied in a strip of Dumbing of Age.
- Our Little Adventure has a lovely example from Julie to Angelika.
Julie: If you had ranks in Knowledge: Arcana, you would've known that would happen.
- The Order of the Stick, "Nuthin' but Net": Elan, Durkon and Daigo are caught in a trap left by island orcs. Durkon and Daigo get out and try to leave, despite Elan begging them to return under the net... Cue the orcs immediately catching Durkon and Daigo and beating them up.
Elan: Fight, fight, fight, fight the urge to say, "I told you so!"
- On This Very Wiki, the You Have Been Warned page (which is more of a Cassandra Truth), or pot-holing text to Shmuck Bait.
- In Ben 10, one episode starts with Gwen warning Ben against playing around with the Omnitrix when he doesn't understand it. After accidentally breaking off a part and trying to fix it with gum, it starts changing him into counterproductive alien hybrids. In a Running Gag, Gwen refuses to make the expected "I told you so" speech, which drives Ben crazy waiting for it.
- Ben 10 Alien Force episode "Vengeance of Vilgax: Part 2"
Azmuth: Ben Tennyson, I warned you of the consequences of tampering with the Omnitrix.
Ben Tennyson: I was just trying to...
Azmuth: Defy my instructions. Well, you have succeeded! The escape geno types...
Ben Tennyson: What?
Azmuth: Your transformations. They will perish if they aren't restored to the Omnitrix in 24 hours. And if they do, their powers will be lost to you forever!
- Sealab 2021
- A Running Gag in the episode "In the Closet", in which Murphy sucker-punches everyone who enters the utility closet they're locked in, declaring "I warned him," when the closest he comes to a warning is "stop it," and then only half the time.
- In the same episode, however, the trope is played straight when Marco warns Sparks that the door is broken.
Sparks: (closing door) It's not broken, you just...
(the door fails to open)
Sparks: You just press the... you ju... The door's broken. Wha-wha-wha-what the hell?
Marco: Idiota! Cabeza de piedras!
- The Simpsons: "Lisa the Vegetarian," after Lisa has twice questioned the use of meat and her teacher/Lunchlady pressed the "Independent thought alarm."
Skinner: Oh oh. Two independent thought alarms in one day. The students are overstimulated. Willie! Remove all the colored chalk from the classrooms.
Willie: I warned ye! Didn't I warn ye?! That colored chalk was forged by Lucifer himself!
- In American Dad, Stan once framed his wife for murder just so he wouldn't have to hear her say this. This episode is even titled "Four Little Words". He realized, though, that he could circumvent this by admitting his guilt before Francine has a chance to say it. It doesn't make her any less enraged, though.
- Psycho, the minion Seers of Dr. Killemoff in Toxic Crusaders usually says this after his Cassandra Truth gets blown off by Killemoff as ridiculous and the good guys win.
- In Wakfu season 2 episode 5, Sadlygrove tries to warn Yugo, Amalia and Evangelyne of the dangers of the Dragon-Pig's lair, as he's the only one with experience in Dungeon Crawling. They pay him no heed, used to ignore the Idiot Hero... until the three are struck with a Baleful Polymorph. Grovy then admonishes them with the page quote.
- Brainy Smurf manages to get in a few of these in some episodes of The Smurfs when he chides his fellow Smurfs about certain actions they failed to take that end up in disaster for the village.
- Codename: Kids Next Door: In the first of many confrontations, Numbuh five has a candy stolen by her former candy hunting partner now rival, Heinrich. And tracks him to a temple where he wishes to use said candy in a ritual to become the king of sweets (its an odd series). Before he does, he disregards the hieroglyphs in which Numbuh 5 enters and warns him that if he is greedy the candy will taste like asparagus. Heinrich doesn't believe her and proceeds with the ritual. Once its done of course, the curse mentioned takes effect and he blames her. She retorts she did warn him.
- Phineas and Ferb: Doofenshmirtz was once about to lose his home for not paying the mortgage. When Agent P suggested him to ask his ex-wife for money, he refused to avoid the trope. She warned him not to spend money on the gargoyle statues.
- "One of the few things in life more satisfying than saying 'I Told You So' is being told not to say it."