- In Black Butler, when Grell returns in the manga on the Campania, the ship voyage arc, Sebastian and Ciel are very surprised (oh crap) to see her return.
- This happens so much in Karakuri Circus that they should really just rename the series to 'Oh, Crap'.
- Hetalia Bloodbath 2010: The general reaction when General Winter is defeated by the mysterious shadow.
- Lone Wolf and Cub is practically constructed of these and Crowning Moments of Awesome for the main character, Ogami Itto. Oh Crap faces generally come up more or less every time someone either recognizes Itto or he reveals himself, generally by pulling out his sword, running at somebody, and shouting "Assassin, Lone Wolf and Cub! I come for your life!"
- In the case of the latter, Oh, Crap is an understatement.
- It happens many, many times in Mazinger Z. A good example was when Baron Ashura was relaxing in his/her submarine fortress, feeling safe due to the knowledge of Mazinger Z could not reach him/her underwater because it had not been built to swim or dive... when one of his/her Mooks showed him/her through one screen Mazinger-Z was swimming towards them.
- And in other episode, Ashura kidnapped Aphrodite A and examined it to learn how building a Photon engine. Later, when Mazinger Z broke into his/her base, a short-circuit burnt the computer they were using, destroying what information they had obtained. Ashura's expression was priceless (one of his/her Mooks got to drag him/her away because he/she kept staring at the ruined computer).
- This is Dr. Hell's default expression in the final battle of Shin Mazinger, as every attempt to stop Kouji fails and more and more ridiculous rocket punches get thrown his way.
- A more tragic example happens when Prof. Yumi and Prof. Gordon are talking about a Mechanical Beast that is sinking ships... and Gordon realizes his wife and their daughter are traveling by sea.
- Used to great effect in Episode 9 of Steins;Gate when Okabe finds out just how much D-mail has changed the past.
- In CLANNAD, where Okazaki Tomoya's face switches to this when he looked at Fuuko holding her starfish bread, (after everyone asked him to eat their bento, 3 full course meals each) telling him to pick the best choice (switching to Tomoya's face sweating). Cue Skip Scene to where Sunohara congratulates him and Okazaki suffering from a heartburn from eating meals from 5 people.
- Death Note
- Nanoha from Magical Girl Lyrical Nanoha tends to draw this sort of reaction from her enemies.
- Smug Snake Quattro, providing the image for this page up above, had this reaction twice in a row. First when she learns that Nanoha has found her location, then again a few seconds later when she realizes Nanoha plans to take the shortest route there. Video. Three if you count her reaction after she sees the actual beam speeding toward her.
- Just to specify the 2nd reaction a smidge: Between them, Quattro calms herself by remembering that she's at the heart of the ship, filled with lots of hallways filled with drones, and that Nanoha can't possibly get to her in time. Then she notices Nanoha charging up a powerful magic attack, and wonders if she's planning on trying to blast through the ship, which is made to shunt magical energy. The second Oh, Crap moment (complete with the above-mentioned face) hits upon remembering just who the hell she's dealing with, what the hell that person is capable of, and suddenly realizing the horrifying truth—Yes. Yes, she is.
- Even before that, Vita had this reaction when Nanoha fires an attack that would make a Wave Motion Gun envious.
- And even before that, Fate shows this reaction when, after barely surviving the aforementioned attack, she discovers that Nanoha has another Wave Motion Gun. A bigger one.
- Nanoha and Co. are on the receiving end in A's when they realize that the Book of Darkness, having absorbed Nanoha's magical abilities, is able to cast said bigger Wave Motion Gun at them.
- She also had one when she realizes that Shamal tried to absorb her Linker Core, right before she fires Starlight Breaker to crash the dimensional barrier deployed by the Wolkenritter. Nanoha being Nanoha, though, she fires anyway.
- Numbers cut loose. Fate appears. Fate stops the pursuit. Numbers wonder what's going on. And then it cuts to Hayate in the sky, casting a very ugly spell that we had all but forgotten she still had: Diabolic Emission. Oops.
- A lighter version for Ginga in Episode 15, when Nanoha suggests a sparring battle of Ginga and the four Forwards (the new kids) vs. herself, Fate, Signum, and Vita. She seems to be just surprised at first, then it slowly dawns on her...
- Ginga gets another one in Episode 26, just before Subaru Divine Busters the Numbers' brainwashing right out of her.
- This AMV matches Nanoha's Oh, Crap moments with Alucard's (mentioned below), to great effect.
- Nearly as epic as Quattro's expression is the Oh, Crap we get from Palus Abel in GaoGaiGar FINAL just before the unveiling of the Goldion Crusher. In the last stages of the final battle, the heroes have been put completely on the ropes and are now outnumbered hundreds to one thanks to Pisa Sol's regeneration abilities. Abel is as smug as she's ever been in the series... until she has this exchange with Soldato-J and Renais:
- For those wanting to know: After getting beaten down by the heroes twice, Palus Abel orders Pisa Sol to put the Pas-Q Machine, their group's matter-regeneration device, into overdrive, reviving and cloning the Sol Masters en masse. This, however, drains the Pas-Q Machine, which their continued existence now depends on, of so much of its power that it is shut down for a period of time and left vulnerable to a strike from the Goldion Crusher. Just as the heroes had planned.
- The Gunslinger Girl manga has a few of these, especially when mafia guy Cristiano sees that Rico has taken out his getaway driver and smashed his face into the window of the car.
- In Zipang, a World War II American submarine commander has one of these looks when a modern-day Japanese destroyer that got sucked through time into the Battle of Midway manages to start its engines and move out of the path of two torpedoes from a dead stop, something ships back then couldn't achieve. He gets another one when he discovers that a fired ASROC (anti-submarine rocket), a modern-day anti-submarine weapon, has the ability to home in on his submarine.
- Higurashi no Naku Koro ni Kai
- "Not her! No!" Myotismon's reaction to Kari activating her crest, everyone. The original line was "Shimatta!" (Oh,no! /Damn!)
- In Digimon Tamers the crew had been fighting "Devas", demi-gods based on the Chinese Zodiac. They'd defeated most of them, leaving a few left. What was it again? Oh, look, Henry's sister is talking to a very large rabbit Digimon, too far away from them to reach her. Oh right, one of the last Devas is a rabbit... OH SHI... Fortunately, Henry's sister manages to get past Antylamon's religious programming through sheer concentrated Moe.
- Ken does one of these in Adventure 02 just before TK unleashes hell on him.
- Kurata from Digimon Savers gets a string of progressively larger ones when ShineGreymon reaches Burst Mode. The Oh, Crap in response to ShineGreymon's Death Glare is the best one because it shows he realizes the tables have completely turned, and now he's the one about to be repaid in full for all the death and destruction he'd caused. Arguably one of the most satisfying Oh Craps in history.
- In Vision of Escaflowne, Dilandau has a particularly memorable one of these after Van goes berserk in the Escaflowne and destroys all of Dilandau's squad. It's easy to imagine that Dilandau may have wet himself during this, though we only see him from the shoulders up.
- In Slayers Try, Xelloss actually utters this phrase when Amelia literally sings him into submission.
- Basically every time some non-boss-level enemy realizes that the flat-chested girl he's been making fun of is actually Lina Inverse...
- In Slayers Next, when Hellmaster Fibrizo realizes that he's just pissed off the freaking Lord of Nightmares, the Hellmaster immediately Screams Like a Little Girl (... in the Japanese version. The English dub just has him speechless with terror. Must've gotten Bowdlerized).
- He screams in the French version too, but it's not THAT convincing.
- In the fifth Slayers light novel, there's an excellent moment where Mazenda has Lina cornered outside of a burning inn. Mazenda is about to finish her off when Lina says that Xelloss is standing right behind Mazenda. Upon hearing Xelloss' cheerful "Behind you, Miss Mazenda!", she immediately flings herself into the burning building to get away. Lina narrates: "Now that, ladies and gentlemen, is fear".
- In the first slayers series (episode 14), Amelia is used as a hostage. She tells Lina to forget about her and just defeat the bad guys. Lina says "Sure, sounds fine to me!"...cue the Oh, Crap look from Amelia.
- In Code Geass, one can argue Lelouch's worst enemy is Murphy's Law and not any of his actual enemies. When something goes wrong (usually when Suzaku decides to show up) he usually spends the rest of the episode Oh Crapping. Considering how often he makes the Oh, Crap face, you can only imagine him making that face when he founds out the Cafeteria is out of Pork Buns.
- Of course, Lelouch being Lelouch, the first five minutes of the next episode usually show him turning it back on his enemies. Only for something even worse to happen to him. Repeat cycle.
- Sorry, but I feel the intense need to mention Suzaku's assault on the Knights of Rounds. Two of this trope within seconds of each other... And, I'm assuming, a couple dozen more when he laser spams an entire fleet out of existence between the aformentioned.
- Suzaku himself has such moments whenever someone turns out to be equal in piloting skills to him. Pretty much any time he fights Kallen when she has a Knightmare on-par or better than his qualifies.
- When Emperor Charles interrupts the ratification of UFN Resolution #1 (the liberation of Japan). He told them basically to BRING IT ON!
- One good example of Lelouch having a moment like this is when The Emperor gets back up after being shot through the heart, and then Lelouch realizes that he is immortal and that neither bullets nor Geass work on him now.
- Or when the Charles realize that he and Marianne are disappearing.
- The most triumphant example was when Lelouch captured Damocles, effectively holding the whole world hostage to the fear of FLEIJA. That was a global "Oh crap!" moment right there.
- Subverted at the end when Lelouch gives one on seeing Zero. Turns out it's all for show, and right before he's stabbed he gives a small, satisfied smile.
- There's also the one in the first season finale. Nina suddenly appears in the Ganymede... which is packing an experimental sakuradite-loaded nuke. Lloyd instantly realizes what it is, freaks out like no tomorrow ("Ikenai!!") and yells at everyone to cease fire, followed by Rakshata realizing that if Lloyd Asplund is freaking, shit's about to hit the fan big time.
- In Tengen Toppa Gurren Lagann Cytomander gets a perfect example of an expression like this when he transforms his mecha into its ultimate form only to see Dai-Gurren flying straight toward him.
- Guame gets an insanely epic one in Episode 11. He's effortlessly chomping on Gurren, when all of a sudden Lagann combines with it. Simon opens the top of Lagann and starts giving the most incredibly awesome Rousing Speech ever. Guame's expression is essentially frozen in an "OH SHI-" position for the entire scene.
- Simon has one in Episode 15, just before Lordgenome starts beating Lagann with his bare hands.
- Mahou Sensei Negima!
- Class Trip arc Big Bad Chigusa Amagasaki's expression as her unstoppable demon god is frozen and subsequently shattered by a Deus ex Machina in the form of Badass vampire sorceress Evangeline A.K. MacDowell. Also very common in main characters when Not What It Looks Like occurs.
- Additionally, when Negi and Asuna are training against Evangeline right before going to the magic world, when Asuna manages to place a small, thin cut on Eva's cheek:
Asuna: Ah, I got her.
grins, licks up the blood drawn from the already-healed wound and her eyes turn black.
- Perhaps the best one in a recent chapter, when Ala Rubra (four of them, anyway) decide to crash Arika's execution.
Evil Chancellor: Seize those rebels! Do not let those two in the valley escape!
Rakan: Oh? You wanna get it on? You really think you've got the forces for that?
Evil Chancellor:"Do I have the necessary forces? You fool. The guards for this event are more numerous than those you see here. There are two entire fleets stationed over the surrounding area of tens of kilometers, not to mention elite troops numbering around three thousand. You may be powerful, but even you cannot...
Rakan: Like I said. Are you seriously telling me... you think that's gonna be enough?
- Nodoka makes a funny one back in Chapter 251 when Negi decides to disarm the Ardiane Knights' weapons. Negi being himself casts Flans Exarmatio but unfortunately, due to his Power Level being higher than anyone else, strips the females of all of their clothing.
- When Negi and his friends realize that Chao sent them a week into the future where she has already won.
- In Chapter 292, Tsukuyomi's expression is most definitely this trope when Negi catches her trying to kill a member of the heroes. She can't actually say the trope, though, since Negi is holding her off the floor by a one-handed death grip on her neck.
- Takamichi's expression in Chapter 99 when he realizes Negi is right behind him with a spell ready fits, although it is part pride in his friends son
- Happens for the first time towards the end of the third chapter.
- Rakan gets and causes a few; like when Negi realizes that Rakan entered the tournament; Kotaru is confronted by Rakan's opening attack; Rakan suddenly realizes that Negi hadn't tried to counter or dodge said attack; Negi realizes that Rakan can predict his lightning-speed movements (with Rakan's elbow inches from his face); and when Rakan is caught in Negi's trap and realizes the entire match was a setup.
- Chisame pulls a wonderful example of "Oh Crap" face in Chapter 311. Seen above.