Little soldier boy
Come marching home
Brave soldier boy
Comes marching home...

The scene is when Zuko joins Azula during 'Crossroads of Destiny'.
Actor Zuko: I hate you, Uncle! You smell! And I hate you for all time!
Katara: [Shocked] You didn't really say that, did you?
Zuko: [Ashamed] I might as well have.

Zuko and Azula are about to begin their Agni Kai
Azula: I'm sorry it has to end this way, brother!
Zuko: No you're not.

Zuko apologizes to Iroh for his previous betrayal at Ba Sing Se
Zuko: Uncle, I know you must have mixed feelings about seeing me. But I want you to know... I am so, so sorry uncle. (starts crying) I am so sorry and ashamed of what I did! I don't know how I can ever make it up to you, but I...
(Iroh grabs Zuko by his shirt and embraces him)
Zuko: How can you forgive me so easily?! I thought you would be furious with me!
Iroh: I was never angry with you. I was sad, because I was afraid you'd lost your way.
Zuko: I did lose my way.
Iroh: But you found it again! And you did it by yourself! And I'm so happy you found your way here.
Zuko: It wasn't that hard uncle. You have a pretty strong scent.

[Aang, Katara and Sokka walk toward Omashu's gate, but are stopped by the gate guards, one of which positions a rock over Aang's head]
Gate Guard: Halt! State your business here.
Aang: [runs up to the guard] [elderly voice] My business is my business young man and none of yours! I've got a good mind to put you over my knee and paddle your backside!
Gate Guard: Settle down, old timer. Just tell me who you are.
Aang: Name's Bonzu... Pippenpaddle-Oppsocopolis... the Third, and these are my grandkids.
Katara [now smiling serenely]: Hi, June Pippenpaddle-Oppsocopolis. Nice to meet you.
Gate Gaurd: [to Katara] You seem like a responsible young lady. See to it that your grandfather stays out of trouble. Enjoy Omashu.
[Aang, Katara and Sokka walk to the gate until the guard stops Sokka]
Gate Guard: [places a hand on Sokka's shoulder] Wait a minute... [Sokka becomes nervous] ...you're a strong young man. Show some respect for the elderly and carry your grandfather's bag!
Aang: Good idea! [throws Sokka his bag]

[About defeating the Fire Lord without killing him]
Aang: Maybe we can make some big pots of glue and then I could use gluebending to stick his arms and legs together so he can't bend anymore.
Zuko: Yeah. Then you can show him his baby pictures and all those happy memories will make him good again.
Aang: (eagerly) Do you really think that would work?
Zuko: No!

[After Aang calms the spirit of the forest, Sokka and other villagers are brought back]
Katara: Sokka!
[Katara runs to Sokka and hugs him]
Sokka: What happened?
Katara: You were in the spirit world for 24 hours. How do you feel?
Sokka: Like I seriously have to use the bathroom! [runs off]

[After Azula tricked Zuko into knocking Mai, and himself, into a fountain to put out the flaming apple on Mai's head]
Ursa: I was just coming to get you. Uncle Iroh sent us a letter from the war front. ...You're soaking wet.
Zuko: Girls are crazy!

[after Smellerbee is hurt by Iroh's mistaking her for a boy, Longshot catches up with her and looks at her without speaking]
Smellerbee: I know. You're right. As long as I'm confident in who I am, it doesn't matter what other people think. Thanks, Longshot.
[Longshot nods]

[context: Azula is talking to the Kyoshi warriors, who fight with fans]
Azula: Who are you? The Avatar's fangirls?
[a short pause]
Ty Lee: ...Oh! I get it! Good one Azula.

[In a flashback, the leader of the Southern Raiders Fire Navy division is interrogating Katara's Mother, Kya, to reveal the identity of the last Waterbender.]
Kya: If I tell you, do you promise to leave the rest of the village alone?
Yon Rha: [Nods in assent]
Kya: ...It's me. Take me as your prisoner.
Yon Rha: [ cruel smile] I'm afraid I'm not taking prisoners today...
[Back in the present.]
Katara: She lied to you. She was protecting the last Waterbender.
Yon Rha: What? Who?!
Katara: Me!
(Katara raises her hands and the rain suddenly stops all around them and reforms into a huge dome of water; she sends a rush of water at Yon Rha, transforming it into ice daggers that stop just short of killing him; suddenly, Katara relents and lets them melt)
Yon Rha: [Drops to his knees in terror] I did a bad thing! I know I did and you deserve revenge, so why don't you take my mother? That would be fair!
Katara: I always wondered what kind of person could do such a thing, but now that I see you, I think I understand. There's just nothing inside you, nothing at all. You're pathetic and sad and empty.
Yon Rha: Please, spare me!
Katara But as much as I hate you... I just can't do it.

[Katara starts coughing]
Aang: Oh no, not you too.
Katara: Relax, It was just a little cough. I'm fin--
[She coughs again]
Aang: That's how Sokka started. Now look at him! He thinks he's an Earthbender!
Sokka [delirious]: Take that, you rock!

[Pirate Captain and Zuko are fighting]
Iroh: Are you so busy fighting you cannot see your own ship has set sail?
Zuko: We have no time for your proverbs, Uncle!
Iroh: It's no proverb. [Aang and others getting away in pirate ship]
Pirate Captain: Bleeding hog monkeys! [Zuko laughs; the pirates laugh as they drift after Aang and his friends]
Zuko: Hey! That's my boat! [runs after them]
Iroh: Maybe it should be a proverb.

[Pirates capture Aang in net.]
Pirate: I got him, come on!
Sokka: Oh, what? I'm not good enough to kidnap?
[Pirates capture him in a net too.]

[Sokka is buried in the earth and is pleading to the spirits to let him out]
Sokka: Okay, karma person or thing, whoever's in charge of this stuff... If I can just get out of this situation alive, I will give up meat and sarcasm. Okay? That's all I got. Pretty much my whole identity: Sokka the meat and sarcasm guy. But I'm willing to be Sokka, the veggies and straight talk fellow. Deal?
(sees Aang approaching)
Sokka: Aang! Thank goodness! Have you got any meat?
(Aang has just agreed to earthbend Sokka out of the ground.)