Well until I get home and can watch this, I'm going to list MY favorite Tyrion quotes from the series so far.
Tyrion: Let me give you some advice bastard. Never forget what you are. The rest of the world will not. Wear it like armor, and it can never be used to hurt you.
Jon: What the hell do you know about being a bastard?
Tyrion: All dwarfs are bastards in their father's eyes.
Jaime: Tell me you're not thinking of taking The Black.
Tyrion: And go celibate? The whores would go begging from Casterly Rock. I just want to stand on the edge and piss off the end of the world.
Bran: I'm not a cripple.
Tyrion: Then I'm not a dwarf. My father will be rejoiced to hear it.
Tyrion: You love your children. It's your one redeeming quality; that and your cheekbones.
Tyrion: I will hurt you for this. A day will come when you think you are safe and happy, and your joy will turn to ashes in your mouth. And you will know the debt is paid.
Meryn: No one threatens his grace in the presence of the Kingsguard!
Tyrion: I'm not threatening the king, Ser, I'm educating my nephew.
Tyrion: Bronn, the next time the Ser Meryn speaks, kill him.
Tyrion: THAT was a threat. See the difference?
This entire sequence might be my favorite of season 2:
Tyrion: Tell me, when your men slaughtered Ned Stark's men at the throne room, did you give the orders?
Janos: I did, and I would again. The man was a traitor. He tried to buy my loyalty.
Tyrion: The fool. He had no idea you were already bought.
Janos: Are you drunk? I won't have my honor questioned by an imp!
Tyrion: I'm not questioning your honor, Lord Janos. I'm denying its existence.
Janos: If you think I'll stand here and take this from you, dwarf...
Tyrion: Dwarf? You should have stopped at imp. And yes, you will stand here and take it from me, unless you like to take it from my friend here.
Tyrion: I intend to serve as Hand of the King until my father returns from the war. And seeing as you betrayed the last Hand of the King, well, I just wouldn't feel safe with you lurking about.
Janos: My friends at the court will not allow this! The queen herself...
Tyrion: The queen regent. And you are a fool to believe she is your friend.
Janos: We shall hear what Joffrey has to say about this!
Tyrion: No, we shall not.
Tyrion: There's a ship leaving for Eastwatch-by-the-Sea tonight. From there, I'm afraid it's rather long walk to Castle Black. I hope you enjoy the Wall. I found it surprisingly beautiful... in a brutal, horribly uncomfortable sort of way.
Tyrion: We've had vicious kings and we've had idiot kings, but I don't know if we've ever been cursed with a vicious idiot boy king!
Cercei: Aren't you always so clever with your schemes and your plots
Tyrion:Schemes and plots are the same thing.