Zuko (yelling angrily toward the sky): You've always thrown everything you could at me! Well, I can take it, and now I can give it back! Come on! STRIKE ME! You've never held back before!

Zuko (after catching Sokka trying to sneak away on Appa): Not up to anything, huh? (Sokka screams and falls off Appa)
Sokka: Fine, you caught me. I'm gonna go rescue my dad. You happy now?
Zuko (darkly): I'm never happy.

Zuko (sees Azula falling): She's... not gonna make it. (Azula saves herself with her firebending and hair pin) Of course she did.

Zuko (to Katara): I know who killed your mother. I'm going to help you find him.

Zuko (tossing Aang to the side): Here for a rematch?
Katara: Trust me, Zuko. It's not gonna be much of a match.

Zuko (while he and Aang are on their way to the Sun Warriors' ruins): We've been riding for hours. I don't know why, but I thought this thing would be a lot faster! (Appa growls)
Aang: Appa's right, Zuko. In our group, typically we start our missions with a more upbeat attitude.
Zuko (under his breath): Oh, I can't believe this.
Aang: Don't worry. You'll get the hang of it.

Zuko: (Gives dagger to Lee) Read the inscription.
Lee: Made in Earth Kingdom...
Zuko: The other one.
Lee: Never give up without a fight.

Zuko: (looking at the tied-up Appa) Uncle?
Iroh: (walks into the cell) So, the Blue Spirit? I wonder who could be behind that mask?
Zuko: What are you doing here?
Iroh: I was just about to ask you the same thing. What do you plan to do now that you've found the Avatar's bison? Keep it locked in our new apartment? Should I go put on a pot of tea for him?!
Zuko: First I have to get it out of here.
Iroh: And then what?! You never think these things through! This is exactly what happened when you captured the Avatar at the North Pole! You had him, and then you had nowhere to go!
Zuko: I would've figured something out.
Iroh: No! If his friends hadn't found you, you would have frozen to death!
Zuko: (very angry) I know my own destiny, Uncle.
Iroh: Is it your own destiny, or is it a destiny someone else has tried to force on you?
Zuko: Stop it, Uncle! I have to do this!
Iroh: I'm begging you, Prince Zuko! Its time for you to look inward and begin asking yourself the big questions: Who are you? and What do you want?

Zuko: (After Katara heals him, whispering) Thank you, Katara.
Katara: (Tears running down her face) I think I'm the one who should be thanking you.
[Azula has been watching in fury; she exhales uncontrollably, breathing fire out of her mouth, screaming and rolling around and falling on her back; Zuko and Katara watch, stunned, as she sobs hysterically]

Zuko: (paralyzed) Uncle? I didn't see you get hit by the tongue.
Iroh: (holding a paralyzed June in his arms) Shhhh!

Zuko: (passing the Herbalist Institute) We're looking for someone.
Herbalist: I hope it's not Miyuki. (looks at her cat, Miyuki) Miyuki, did you get in trouble with the Fire Nation again? (meows)

Zuko: (pushing through a crowd) Out of my way! Step aside, filth!
Iroh: He means no offense! I'm certain you bathe regularly...
Zuko: I need to talk to you.
June: Well, if it isn't my new friends, Angry Boy and Uncle Lazy.
[Iroh laughs heartily for a moment.]

Zuko: (to Azula during their Agni Kai) No lightning today? What's the matter, afraid I'll redirect it?
Azula: Oh, I'll show you lightning!

Zuko: (To himself, after revealing to Aang that he was the one who sent Combustion Man) Ugh, why do I have to be so stupid? How could I tell them that I sent an assassin after them? Couldn't I say that Azula did it? They would've believed that! Stupid! (Hits his head)

Zuko: (to Katara) Where is he? Where's the Avatar?
Sokka: We split up; he's long gone.
Zuko: How stupid do you think I am?
Sokka: Pretty stupid. RUN!