Diana Rigg

Lord Varys: "Mylady. I wanted to personally welcome you to Kings Landing, the city has been made brighter by your presence."
Lady Olenna Tyrell: "The city is made brighter by my presence. Is this your usual lying Lord Varys? You're here to seduce me?"
Lord Varys: "A little obvious perhaps."
Lady Olenna Tyrell: "Oh no please! Seduce away it's been so long! I rather think it's all for naught. What happens when the nonexistent bumps against the decrepit? A question for the philosophers."

"I was told you were drunk, impertinent and thoroughly debauched. You can imagine my disappointment at finding nothing but a browbeaten bookkeeper."
[To Tyrion]

"You've lost, Cersei. It's the only joy I can find in all this misery."