Aizen: I'm sorry. You must have been worried. I'm really sorry. I'm sorry for hurting you so much. There was something I had to do. Thank you, Hinamori. Thank you so much. Goodbye.
Chapter 147: Vice-Captain Hisagi looks like he's defeated Fifth Seat Ayasegawa and lectures Yumichika that he should give up because there's no possible way for a fifth seat to defeat a vice-captain and dying in such a pointless fashion would be a terrible death for a member of the battle-loving 11th division. If Yumichika didn't hit the Wham! Line quota with his reveal that he's only such a low seat by choice, his reveal that he's also hiding the truth about his zanpakutou surely does.
Yumichika: "What I show you now is completely confidential. Take a peek at the true power of my zanpakutou!"
Ichigo: Will they go back to the way they were if we were to kill Tsukishima?!
When Ishida finally rejoins the battle, two lines in a row:
Ishida: The one who cut me...is [Ginjou] standing behind you! Ginjou: I made Tsukishima cut me twice to go back to my original self.
Yukio: You said we'd share. After Ginjou uses Ichigo's stolen fullbring, confirming the other Xcution members were in on the plan from the start.
Ginjou: "You only wanted to believe, didn't you, Ichigo? Let me tell you the identity of the man behind this scheme...Captain of the 13th Division - JUSHIRO UKITAKE!
Sasakibe:..The..There is...There is something i need to tell you ..The..they can...BANKAI!
Technically, this could mean that they can negate Bankai, as Ivan was attempting on Ichigo.
Chapter 485 gives this:.
Yuki: The First Division's Vice Captain Choujirou Sasakibe...died.
This being in a series that, throughout numerous nearly-hopeless battles against supreme evils, stabbings through the chest, etc., no (good) captain or vice-captain has ever died until now.
Mao: (to Suzaku) Get your hands off of me, father-killer!
R2 Episode 5:
Nunnally: Hello? Big brother? Lelouch, is that you. It's me, Nunnally; Can you hear me? I'm coming over there to Area 11 to be the viceroy. Um, is there something wrong? Lelouch, it's Nunnally, your sister!
R2 Episode 18:
Lelouch: Could that be the weapon Suzaku was talking about? ...Nunnally!
Sasuke: Why would Itachi do such a thing? Madara: Don't you get it? It was to...protect you.
And one chapter later.
Madara: But he was ordered to do so by Konoha.
In Ch 499:
Kushina: I...was the Kyuubi's previous host...
Even Chapter 1 has a line that changes Naruto's understanding of his past and the course of his entire life.
Naruto: What...was the decree? What? Mizuki: That no one must ever tell you...that what you really are...is the demon fox!
And later on in the Waves arc.
Chapter 437 featured one for Naruto:
Hinata: I'm not afraid to risk my life for you...because I love you." Pain: *Kills Hinata right in front of Naruto, unleashing the mother of all Unstoppable Rage, going straight to a six-tailed transformation.
My Hero Academia Shortly after Tsuyu asks where Bakugo is, Deku says he's right behind them. Deku's group turn around, and then we get brief dramatic music.
This exchange from Soul Eater, just as Crona is forgiven by Death for furthering the madness that was in Stein. Granted, this series has a lot after the halfway point.
Nygas: Medusa. Just what are you doing here? Medusa: I'm not looking for a fight. I surrender.
The manga has the Great Old One of the Book of Eibon calling Death the Kid; a "fragment of Shinigami."
There's also the last line of Chapter 88, where the Spartoi kids find out that they've been ordered to execute Crona. Considering that the rest of Chapter 88 was a total filler chapter...yeah. Wham! Line.
Haruhi Suzumiya: "...that's why I'm going to kill you and see how Miss Suzumiya reacts!"
Chapter 104, what Father says summarizes the WHAM situation the best:
Father: For me to imprison God within my body required enormous energy. And the citizens of this country provided it for me.
Also, two chapters previously...
Roy Mustang: "I...can't see."
Even before that: "He's the son of some distant relative of my husband."
And before any of these:
Bradley: "Just as you have the Ultimate Shield...I have the Ultimate Eye."
Chapter 97, after it was thought that Wrath was dealt with...
Bradley: Hello everyone. I see that everything has gotten quite out of hand during my absence. I am coming to personally take back control of my country, and put down this coup.
Death Note, in the English translation, sets the record for wham-to-letter ratio with the line "I am L" spoken by L to Light, in person.
Mikado: I have neither the power nor wisdom to oppose a foe who won't listen to reason. You won't even give me time to try. And so...I'll rely on numbers!
From episode 10: I have all the pawns I need
Also, in the graphic novel when Simon suddenly punches Izaya in the face and says: Have you ever killed people? I have.
Grave of the Fireflies: After returning from buying food, Seita comes back to a severely ill Setsuko who is delusional and weak. He gives her something to eat and makes dinner, bringing hope that Setsuko would recover. Then, after Seita leaves the scene, leaving Setsuko to lie there with a hunk of melon you think she'd wolf down, he voices over the line: "She never woke up". After that...you pretty much know what happened.
Precia: I'll put an end to everything. To all the time this girl was deprived of when I lost her.. and also to the doll I created to play as my daughter.
"You want to know something nice? Ever since I made you...every single moment...I've despised you."
Bakuman｡ Chapter 100: "PCP isn't going to get an anime."
Chapter 76: "I WANT TO QUIT TANTO!"
In Chapter 46, Azuki tells Mashiro that she’ll hate him if he doesn’t take time off work until he’s discharged from the hospital, but Mashiro, not believing her, refuses. She then apologizes and says "I've been in love with you for eight years, so how could I hate you?", which surprises him, as it is the first time he learns that she had always loved him.
Chapter 150: "Well, you could say it's my last act of selfishness as editor in chief"
Chapter 164: "Congratulations. On Tuesday, September 1st at 4, the anime for REVERSI will start."
Fate/stay night (manga): "What a disappointment though. I expected more from Kiritsugu Emiya's successor."
This dialogue.
Shinji: Rider...you saved me? Rider: Make no mistake. The false contract between us is at an end. I was merely obeying my master's orders. Shinji: No way! So that means... Sakura: That's right, Nii-san. I asked Rider to save you using my final command mantra.
School Days, final episode: Makoto has received a text message on his cellphone which just says "sorry," followed by a whole bunch of empty lines that scroll down, leading up to one word: "Sayonara." Cue seriousOh Crap.
The manga does this in spectacular fashion in the last chapter.
Kyubey (Episode 6): "You people are all the same. I don't get it. Why do you people care so much where your souls are?" Kyubey (Episode 8): In this country they call girls shoujo, and for girls who are growing up to be witches (majo), it's logical to call them "magical girls" (Mahou Shoujo). Homura (Episode 8): I will not allow your plan to succeed, Kyubey...no, Incubator. Madoka (Episode 11): Homura...I'm sorry.
Kyubey gets a lot of these. Practically every episode after the third has at least one Wham! Line from Kyubey.
Braiking Boss: I was the one who gave the order...to kill Luna.
Ore no Imouto ga Konna ni Kawaii Wake ga Nai! manga, chapter 25: "I'M...DEEPLY IN LOVE WITH MY SISTERRRRRR!!" If you've read the novel or seen the anime, you'll know that things are cleared up, but since the manga chapter ends on a Cliff Hanger...
Going back to the original series, from episode 24, we learn the truth behind the AT Field:
Kaworu: "That's right. That's what you Lilin call it. The sacred domain where none may trespass. The light of the soul. Lilin, you know, don't you? That the AT Field is the wall that everyone has in their heart?"
In Mai-Otome, John Smith admits that he can't take on a Materialized Arika, and so calls for help from The Mole.
Third Princess Carissa: “Begin the invasion. I now have Curtana Original, the sword that decides the king, within my grasp. This makes me, Carissa, the ruler of the United Kingdom. Anyone that does not want to see the country decay under the rule of the previous pacifist queen, stand up of your own will. To bring about the new United Kingdom, leveling some things will be necessary and some destruction will be necessary.”
In the Mai-HiME manga, Nagi is able to throw his foes into disarray long enough to attempt to escape with the following question.
Nagi: This may be odd for me to ask right now, but how did it taste...when you kissed Mai-chan?
In the anime, Shiho, with the following line, essentially admits to killing Takumi
King Kai: Knock it off! You're all being foolish! You don't know what you're talking about! Goku has been using the Kaioken attack the entire time.
We have several in the next saga, usually from Trunks, such as:
Trunks: You've miscalculated. Son Goku is not the only Super Saiyan! Trunks: You die before then. You contract a terrible heart disease and pass away. Trunks: (revealing his mother is Bulma) She's right over there. Trunks: What is this thing? I've never seen this android before!
Hikaru: "Then tell us why you summoned us to Cephiro?" Emeraude: "I summoned the Magic Knights to Cephiro...so that you could kill me".
In One Piece, Kaku gives some very unpleasant news when the Straw Hats ask about the Going Merry.
Kaku: I'm going to give it to you straight. Your ship......can't be fixed! Not even with our skills!
Another one from Chapter 550:
Sengoku: The truth is...Portgas D. Ace: your father is Gold Roger!
In the Ace Attorney manga, Edgeworth argues that Bobby Wolfe might have burned down the Den of Spiders if he intended to turn himself in or commit suicide, leaving no one to care for his spiders. Phoenix then argues that his friend Thomas Spitzer could have cared for them.
Edgeworth: Well then, why don't we ask him? I would like to call my next witness, Thomas Spitzer. (Cue Oh Crap from Phoenix as Spitzer testifies for the prosecution.)
Strength/The Real Koutari Yuu: Your greeting is rather late, Mato Kuroi. I see my Strength has been relying on you...My name is Yuu Koutari. Strength is down here right now, just as you are.
Jack Vessalius: So Glen... why don't you lower that sword... before I kill your cute little servant?
This line is the first reveal of the fact that Jack has been lying toeveryone the entire manga. It only gets worse from there.
The line "It's no use taking revenge for a 21-year old..." in the sixth episode (the middle point of the first cour) of Mobile Suit Gundam: The Witch from Mercury completely changes the viewer's understanding of when the episode Prologue took place, and says the 4 year old girl seen in that episode is not the now 17 year old protagonist.
