Jack Gleeson

Joffrey Baratheon: "I am the king! I will punish you."
Tywin Lannister: "Any man who must say, 'I am the king' is no true king."

Joffrey Baratheon: "Tell me about the Targaryen girl in the east. And her dragons."
Tywin Lannister: "Where did you hear about this?"
Joffrey Baratheon: "Is it true?"
Tywin Lannister: "Apparently so."
Joffrey Baratheon: "Don't you think we ought to do something about it?"
Tywin Lannister: "When I was Hand of the King under your father's predecessor, the skulls of all the Targaryen dragons were kept in this room. And the skull of the last of them was right here. It was the size of an apple."
Joffrey Baratheon: And the biggest was the size of a carriage."
Tywin Lannister: "Yes, and the creature to whom it belonged died 300 years ago. Curiosities on the far side of the world are no threat to us."
Joffrey Baratheon: "But how do we know that these dragons are just curiosities and not the beasts that brought the whole world to heel?"
Tywin Lannister: "Because we have been told as much by the many experts who serve the realm by counseling the King on matters about which he knows nothing."
Joffrey Baratheon: "But I haven't been counseled."
Tywin Lannister: "You are being counseled at this very moment."
Joffrey Baratheon: "I should be consulted about such things."
Tywin Lannister: "From now on I will see to it that you are appropriately consulted on important matters. Whenever necessary."

Joffrey Baratheon: "Everyone is mine to torment! You'd do well to remember that, you little monster."
Tyrion Lannister: "Oh, 'monster'. Perhaps you should speak to me more softly then. Monsters are dangerous and, just now, kings are dying like flies."

"My mother wishes me to let Lord Eddard join the Night's Watch. Stripped of all titles and powers, he would serve the realm in permanent exile. And my Lady Sansa has begged mercy for her father. But they have the soft hearts of women. So long as I am your king, treason shall never go unpunished. Sir Ilyn, bring me his head!"

Joffrey Baratheon: "I'll tell you what. I'm going to give you a present. After I raise my armies, and kill your traitor brother, I'll give you his head as well."
Sansa Stark: "Or maybe he'll give me yours."