In Digimon Savers episode 10, Masaru comes under the influence of a curse that Chika put on him (though it turns out to be a digimon that just so happened to have heard her when she was wishing all these bad things on her brother). The following exchange occurs:
Touma: From the looks of that signpost, it seems as though Chika-chan has used some sort of magic to put a curse on you. Masaru: A curse? Touma: It's exactly as Chika had said. Slipping, falling down, getting hit... and now, running into a signpost. Gaomon: And the next one was falling from a bridge, right Master? Masaru: That'll never happen! I mean, there aren't even any bridges near here! (Chopsticksnote which sounds very similar to "bridge" in Japanese roll onto Masaru's path; he slips and falls) Touma: o.0' He fell... from chopsticks...
A prime example comes in volume 14 of Mahou Sensei Negima! After finding out about the pacts some of her classmates have made with Negi, Meta Guy Chisame jokes about making a pact and fighting Robot Girl Chachamaru; in reality, she most definitely wants to be normal. Naturally, she ends up having to do just that by the very next day. At least, very next day from the perspective of a normal person. Time Travel was involved, and depending on how you look at it, it could have been as long as a week.
Even during the first day of the Mahora Festival, Asunatried to pull this off while protecting Nodoka against a World-Tree-entranced Negi:
Asuna: I will protect Honya-chan's lips! If you want to kiss her, then you will have to kiss me first!
(Beat, followed by a twinkle from Negi's eye)
Negi: Understood, I'll kiss with Asuna-san first, then...
A subtler example during the Battle of Mahora between protagonist Negi Springfield and current Big Bad: Negi tells her to surrender, as he had just destroyed the technology that allowed her to fight equally with a mage like him. "You can't beat me, not without magic!" Cue fireball.
A more humorous example occurs way back in chapter 3; Ayaka is talking about how Negi needs someone with a " motherly figure" to take care of him, ending with "and who's got more of a figure than me!?" Cue the four bustiest girls in the class entering the room.
Jack Rakan decided to do Dark Magic to show Negi what happens when one is not compatible saying, it's fine I'm me and I'm invincible. Cue giant explosion and 2-3 chapters of Jack Rakan actually in bandages. Also every time he says he is invincible during that time he gains high pressure blood.
And at the recent chapters... after being ridiculously hit by a bullet that renders his mana useless and being targeted by the FREAKING WHOLE SCHOOL...
Negi: I'll have to be especially careful not to run into the martial artists...
Cue Ku Fei.
Negi: (Well I guess if it's Ku Fei-san...) Are... you... in this too?
Fate's entire harem attempts to do this in one of the Volume 0 chapters, even trying even Naked Apron, and get no reaction whatsoever. Owait, wrong trope.
Naruto: Kankuro tempts fate by addressing Gaara's "impenetrable defenses" in Episode 48. Cue Rock Lee going ballistic and pinballing Gaara across the arena. It doesn't work, however. Not long after, Sasuke pierces Gaara's sand shield and causes him to bleed for the first time.
From the first Shippuuden movie (the one with the Priestess Shion), where Naruto is fighting the Quirky Miniboss Squad. "Hah! That's the weakest fire jutsu I've ever seen!" Cue the wind jutsu, which supercharges the fire one and turns a ring of flame into a blazing maelstrom.
In episode 11 of Neon Genesis Evangelion, after the Tokyo-3 energy supply is sabotaged, Fuyutski says that it would be a disaster if an Angel attacked right now. Which is exactly what happens.
This could actually be a subversion because it's explained later on that he and SEELE know the specific times when the Angels will attack.
Aoba: I just hope they don't start using BC weapons! Things could get pretty ugly... Hyuuga: Yeah, that or N2 mines — (BOOM) Aoba: Speak of the devil...! Hyuuga: Damn! Haven't they ever heard of moderation?! Fuyutsuki: That was a little much... (the JSSDF begins a Macross Missile Massacre on the geofront)
In episode 22, Asuka complains about how the Angel hasn't shown up — just before she gets hit by its Mind Rape beam.
Also surprisingly happens meta-wise, during the infamous "Ran out of ink" rant by Spike Spencer (Shinji's VA). One of the rants against the Gainax Ending is "Okay, the movie better sure as Hell make up for this, I'm telling you right now, 'cause I'm stuck in Nowhereland!". Sure enough, the movie is released, and... it goes From Bad to Worse. Far worse that Spencer might've preferred being stuck in Nowhereland.
In Hayate the Combat Butler, Maria gives Hayate an expensive cashmere jacket to wear out in public and explains very clearly how getting it ruined will likely get him fired. After avoiding all manner of spills and sword-wielding thugs that are all clearly stated to "stain/ruin/cut cashmere very well", he tries to avoid falling into "the kind of pond that ruins cashmere coats" during an attempt to "rescue" Isumi from her servants by taking it off before he hits the water... and promptly ripping it to shreds on a nearby hanging tree.
Later on in the series, Sakuya builds a ship that is an exact replication of the Titanic. It doesn't fare well.
Sakuya also mentioned "unless terrorists hijack"... Guess what happens?
Parodied and subverted in an episode of Pucca. The introduction of the ship Gigantic by the captain includes calling her "unsinkable" three times, and the floor show in the dining hall involves a song including the lyrics "Because the ship can never sink." She hits the iceberg without incident, prompting the captain to cry "I told you it was unsinkable!" Later Double Subverted.
In Monster, after miraculously surviving a suicide run against four armed thugs, Martin pulls out a cigarette and mutters, "I'm surprised I lived through that." Naturally, this is the cue for the guy he missed to fatally shoot him in the stomach.
Roberto laughs at Tenma, telling him that he won't shoot him. Guess what happens next.
Subverted at least once in Naruto Abridged. Two ninja guards discuss their hatred of giant snakes that pop out of nowhere and kill you. Naturally, a giant snake pops out of nowhere and destroys the guard tower... next to them.
In one episode of A's, Amy notes how unlikely it would be to have an emergency that she would have to deal with ... and one comes up before she even finishes the sentence.
In another episode of A's, Shamal finds out Nanoha and Fate are Hayate's friends, and want to visit her in the hospital, which would potentially result in their finding out about her being the master of the Book of Darkness. Signum says, "As long as they don't run into us there, it'll be fine." Guess what happens next episode...
Super Gals episode 39. Ran and Tatsuki (and 10 plus other guys) find a missing monkey, which is wearing Tatsuki's scarf, that has just been said to collect a 50,000 yen reward. You see them chasing it and are then shown Ran's older brother:
Yamoto:What a peaceful Christmas Eve. Looks like I'll get to go on a date with Miyu today without any mishaps.
Alas, what he had in mind was not what happened.
Two episodes from the end of Mobile Suit Gundam SEED, Mu la Flaga reassures Murrue Ramius just before a battle by promising, "I'll be right back, with victory in hand." He isn't.
Not until Destiny, anyway.
Discussed and subverted in Azumanga Daioh, when Osaka predicts that their school trip to Okinawa will be "tons of fun" and Chiyo agrees, which it does turn out to be, on the whole. However, right after she says it, the image freezes and the background fades to black:
Tomo: At that time, they never would have dreamed... it would turn out to be such a miserable trip. Or something. Yomi: Enough with the narration!
In The NinetiesSailor Moon, during the final showdown with Sailor Moon and Chibi-Usa on one side and the big scary skeleton guy Death Fantom on the other, Fantom repeatedly claims that he is eternally immortal. Then he dies.
After dodging a Rain of Arrows, one of the villains in Vampire Hunter D: Bloodlust mutters "That was close..." seconds before the last arrow catches him through the neck.
Fellow robot Mechazawa introduces his little brother Mechazawa Beta in Cromartie High School. "I tell ya, this kid is tough! I guess that kinda stuff runs in the family. Any of you wanna try goin' one-on-one with him? Ha ha! As if!" Crunch. Gorilla crushes the poor tyke underfoot.
Characters in Yu-Gi-Oh! have a tendency to say things like:
Generic Badguy: Oh no, I hope his random trap card with a 1 in 10 chance of hitting me doesn't hit me. If that happened I'd totally lose! (gets hit) Oh no, I just lost! Generic Henchman: Hah, you need to be really lucky to beat my unbeatable strategy! (3 minutes later) Oh no, what are the chances that you had one overly specific card in your deck to beat my strategy?!
Roba: No! If Jinzo hits my Reflect Bounder, it's all over for me! (Jinzo hits Reflect Bounder and both explode) Roba: No! Jinzo has hit my Reflect Bounder, and it is all over for me!
During the Virtual World arc, Yugi is wandering through a seemingly endless tunnel and complains if it's ever going to end, and after Yami Yugi reminds him that Noa controls the Virtual World, Noa decides to teleport Yugi somewhereFor the Evulz. The joke is on him because that results in Yugi reuniting with Anzu, who was in peril during her duel with Crump.
Could be combined with Famous Last Words, but in episode 134 of the dub, when Yugi prepares his final attack, we get this little line from Kaiba:
Kaiba: YUGI! I WILL NOT BE DEFEATED AT MY OWN TOURNAMENT!!!
The Fate/stay nightVisual Novel does this: in the Unlimited Blade Works route, Shirou explicitly states that he cannot die from projecting swords, as it is the one thing he can do (he even considers himself a circuit made solely for that purpose). Three guesses on what happens in the Heaven's Feel route.
In the manga Gun Blaze West, villain "Target" Kevin has a prominent tattoo of a target right over his heart and never wears a shirt so he can show it off. This is later revealed to be the object of a game; He and an opponent shoot at targets on each other's bodies. The fact that he shows his tattoo so proudly illustrates that he never loses.
Code Geass R2 has the rather fantastic example of "Don't worry...It will be impossible for Zero to destroy this place (Tokyo) like last time!" Which is technically true...
The dub makes it clear that they're specifically referring to Zero causing the settlement to collapse in order to weaken the forces defending it, but even before the FLEIJA blast, a Gefion Disturber goes off and disables all the older Knightmare Frames.
There was also when Milly assured Nina there won't be any Elevens at the hotel where they will be staying. They get taken hostage by the JLF.
The most infamous example of this would have to be episode 22 of the first season: "If I were to say 'Kill all of the Japanese' you would be forced to obey..." Too bad Lelouch didn't realize that his Geass had turned permanently "on" when he mentioned this to Euphemia. Cue one of the most tragic and influential events in the whole series.
In Fullmetal Alchemist, one of the members of the top brass, while it is trying to handle Roy's coup d'état, is getting worried about their opposition's effectiveness. Another member says that it's not like they have any tanks with them. Guess what reinforcements from Briggs provides?
Maes Hughes mentions to Envy that he has a wife and kid waiting at home. Cue the Fatal Family Photo.
"Oh hey! We managed to take back Central! Let's celebrate!" Cue King Bradley coming to do damage.
In Eureka Seven, members of the military tend to say things like "This place is so heavily fortified, nobody would ever try to invade!" just before the Gekko shows up.
A notorious example of the "You Just Had to Say It" variety occurs in Elfen Lied, where Bando, after being dismembered by Lucy (who has psychic powers that manifest as hands that can cut/grab/rip apart anything within a 2-meter radius) says that he'd kill her the next time he saw her. She made sure he wouldn't ''see'' her.. He recovers by becoming half-robot.
Fate/stay night's anime has a fun one. In the grand battle between Archer and Berserker, Archer blows the light in the building they're fighting in. When Berserker and Ilya find him, a beam of moonlight has cast itself over him for virtually no reason and poor Ilya is arrogant enough to say "Looks like the lunar goddess isn't blessing you." Oh, how wrongyouare.
In Weiß Kreuz, when a devastated Ouka tells Omi that they're half-siblings, wrecking their romantic prospects, he immediately tries to comfort her by telling her how happy he is to have found a family after being alone for so long, hugging her and ending on "We'll be together forever..." No. No,youwon't.
A slightly less obvious version from Mai-HiME: It was established that whomever the Hime's care the most about is screwed the moment their Child/monster is destroyed. Two Hime's do not have a person shown on-screen that they particularly care about. But they're kind enough to tell us that they do have someone, and say who it is. Their monsters get destroyed the very same episode. Nao's mother goes from first-mentioned to vaporized in less than 3 minutes
In Area 88, the character Boris (known by others as "The Angel of Death") has a reputation of always returning to base alone after a mission, no matter how many pilots go up with him. In the anime, one guy in a flight of four (plus Boris) gets cocky: "We flew with Boris 'The Angel of Death' and survived!" SAMs kill his sorry ass and two other guys 7 seconds later, leaving only Boris to head back to base.
In the fourth episode of Black Butler Ciel Phantomhive had to disguise himself as a girl to get to a serial killer at a fancy party. He says, "Good thing Elizabeth isn't here. I'd hate to have her see me like this." Guess who actually was there?
In Bizenghast, the characters are exploring what looks like a labyrinth. Edaniel and Edrear remind Dinah and Vincent to stay together and that they don't want to lose anyone down there. When they lose Dinah, Vincent goes to look for her, even using the exact phrase "I'll be right back!" Subverted since while everyone except Edaniel falls victim to whatever is in there, they all survive.
In Darker than Black a verbal bouncer at USA Embassy gates vehemently opposed letting a few Tokyo Police representatives to proceed on his territory with attempts to find clues about recent bombing series. At "Don't test my patience!" stage he was rudely interrupted by a loud BOOM—from the inside.
Pokémon Special: Aqua Admin Ark walks home with the award for Biggest Fate-Tempting Blunder, though other characters in other Pokémon works do their fair share from time to time. How big was his blunder?
"You've been in the water for three— no, four minutes. Are you trying to set a world record or something?!" "Oh? Iron Defense? You may have broken Sharpedo's fangs, but you're not out of danger yet... far from it." "Our first task as Admins has been completed." (Evil Laugh)
Why are all of these relevant? The first one is done after flooding a locked, airtight cable car in an attempt to kill Sapphire, who demonstrated physical prowess beyond the average peon the last time they met. The second was when she called out her Lairon to break Sharpedo's teeth in what was seemingly self-defense. And the third came when she appeared to have drowned... in reality, she broke the teeth off with the express intent of using them to pop a hole in the glass and drain all that water out, giving her and Flannery a way to breathe and allow her to mount a counteroffensive. Cue a Did You Actually Believe? from Sapphire as a retort to the Evil Gloating and an extremely justified Oh Crap from Ark, who now knows just how many ways he happens to be boned.
Earlier in the GSC arc, two security guards casually remark what a terrible thing it would be for the Magnet Train to be hijacked, but that it would be impossible to hack the system. Cue their Oh Crap faces seconds before being knocked out by Team Rocket grunts.
Hidamari Sketch. "Today I will not forget to buy new batteries for my clock." Yuno's resolve is helped by the fact that the clock she's borrowing uses as its alarm the sound of a woman screaming as she's being (or about to be) murdered. Even the male gazer extraordinaire would likely find that more than counters the fact that one of the pictures on it is a close-up of boobs. (Barbie Doll Anatomy) But between the lottery tickets, the visit from a former student of Yoshinoya's, and the discovery of abandoned art, she completely forgot until they went to bed that night...
Hanaukyō Maid TaiLa Verité episode 7. Ryuuka is standing in an underground tunnel which has shown itself to be trapped. She says "I'm not like Taro. There's no way I'm going to do anything dumb." Immediately thereafter she accidentally pushes a brick into the wall with her elbow, causing a metal pan to drop from the ceiling onto Taro's head. Lampshaded by Ryuuka herself immediately afterward: "Boy, I sure set myself up."
Every Apostle in Berserk pulls this one. "No mere human could compete with an Apostle!" Then Guts horribly kills them.
A rather memorable example comes from an unlucky group of soldiers. The commander of said soldiers insists that Guts reputation as a "Hundred Man Slayer" couldn't possibly be true, or at the very least, an exaggeration. It's not. May we also point out during this discussion, Guts is beyond a state of Unstoppable Rage after finding poor Griffith in his tortured state. They didn't stand a chance.
This trope is a necessary plot schematic, since a major theme is causality so it's pretty dependent on the main characters making lousy choices that impact their lives.
In Holyland, some Sawako gangsters are saying that after beating up Shinichi they would go after Shougo or Yuu. Cue the former punching one of their own into the room they're in.
In the Axis Powers Hetalia movie, Russia, China, and America are undercover in an UFO trying to find a way to defeat the Pict aliens when they come across a room full of complicated controls. Russia decides to pull a suspicious red lever against the warnings of China, and says:
Nothing bad can possibly happen, so...
He ends up activating an alarm that alerts all the aliens in the UFO and results in the three nations being chased around by aliens.
A group of assassins taunts their victims "What difference can changing your glasses make? Even without glasses, you can see your imminent death." Being Gintama, it turns out that the glasses shoot eye beams, make combat tentacles, predict enemy moves, and transform their user into a magical girl.
On another instance, Gintoki expresses his utter hatred for New Year's cards, and claims he's going personally execute everyone who sends him one. Naturally, he ends up getting hundreds of them in the mail. In an attempt at being Genre Savvy in the same episode, he expresses false hatred for Valetine's Day chocolates, and doesn't get any, much to his irritation.
Guard: "It's not like it's unchained and will return to its original demon form, right?"
Cue the cat turns back into its original demon form off-screen.
Somewhere around 1/3 into episode 5 of Toradora!: "Well, it's not like we'll ever be seeing her again." Oh yes you will. Tomorrow. And for another two. Freaking. Years.
In the first episode of New Dominion Tank Police, the bad guy, an ex-cop, is ascending an elevator shaft in a mobile weapon when Leona and Bonaparte appear in the bottom of the shaft. Said bad guy goes, "They wouldn't dare shoot straight up," figuring that standard tank shells wouldn't reach him, but not only does she shoot straight up (Oh Crap) but she hits him…because she was using a high-velocity armor-piercing shell!
Pokémon anime episode "The Poke Spokesman". At the end Team Rocket is in a balloon in cloudy weather and James says "At least Team Rocket won't be blasting off this time". Seconds later a lightning bolt hits them and they become a Twinkle In The Sky.
in Devil & Devil, two schoolgirls go to their highschool's preparation room during lunchtime to get some tools for their next class' experiment. One of the girls is scared because there were rumors of a monster going around, and her friend playfully teases her about it, saying "there's no such thing as monsters". Next thing you know, a monster shows up, grabs the first girl by the leg, and promptly transforms her into a baby, before turning to the other girl and doing the same thing to her off-panel.
In Bakuman。, Moritaka Mashiro's mother, unwilling for him to pursue a career as a mangaka, is confident that his father will also oppose it (Moritaka's uncle Nobuhiro, who worked himself to death trying to re-establish himself as a mangaka, was Moritaka's father's brother), but finds out that this is not the case. She then suggests going to her father-in-law, "who lost his son to manga," for the key to Nobuhiro's office, might feel the same way he does, but is shocked when he gives Moritaka the keys.
Played ForSadness in Pretty Cure All Stars DX3. During an earlier scene, an annoyed Hibiki Houjou told her familiar Hummy that if she wanted to leave then she shouldn't bother coming back. Cue the final battle against Black Hole and then the realization that if they wanted a shot in victory, that means using the last power of Prism Flower which would sever the connection between the human world and Fairy world... which means, Hummy (and many other fairies) would leave and never come back, and the girls will stop being Pretty Cures. On that realization, Hibiki completely broke down in tears and said she didn't mean what she said, while hugging Hummy. Kind of subverted that thanks to a Deus ex Machina in the post-credits scene, Hummy and the other Fairies managed to make it back anyway.
Attack on Titan: After graduating, Eren says something along the lines of "Now we'll be ready if the Titans attack today!" No, you won't, Eren. No you won't. Also done in the first episode in a similar way, although it's less Tempting Fate than it is a sort of weird prediction. With the first example, given what we now know, choosing that particular moment may have been intentional on Bertolt's part, although it's unlikely that he would have heard Eren from wherever he was before he transformed.
In the Hyperdimension Neptunia anime, Noire notes that her flawless security system being hacked is about as likely as being struck by someone falling from the sky. Over the course of the episode, she is hit by two such airborne projectiles. No points for guessing how well her security fares.
Zatch Bell!: Tia gets angry that another mamodo, Momon, lifted her skirt and took a look at her panties. She pursues him for a while before he's caught by his book master. She muses that at least Zatch and Kiyo didn't see her undies. Cue Momon holding the Goofy Print Underwear he stole from her.
Death Note: Light should've just kept his mouth shut...
Light: The way things are progressing, I can't afford to be seen with Misa.