Cersei Lannister: I always knew you were the stupidest Lannister. The Starks and Targaryens have united against us, and you want to fight alongside them? Are you a traitor or an idiot?

Jaime Lannister: You pledged our forces to fight our common enemy...

Cersei Lannister: I'll say whatever I need to say to ensure the survival of our house.