I'll start it off. This is one of my favorite quotes.

Olivia- "Who cares about me, I wanna know who's next?"
Peter- "I care about you..." Awkward Silence
Peter (attempting to save himself)- "If we can figure out why they needed you then maybe we can figure out who's next" Awkward silence, again

"bishops house of horrors, how can i help?"

"I have thought of a hundred reasons why you should come back. But in the end, you have to come because You Belong With Me"

Peter: "Real is just a matter of perception."

Peter: "You're not from this world Olivia. You're not her. I am here. And I'm the part of you that you have to hold on to. You can't forget Olivia. You can't forget where you're from. You cant forget this"

Walter: I have used this technique to extract information from a corpse once. You can do that if they haven't been dead for longer than six hours.
Peter: Right, because after six hours - that's when they are really dead!
(In German this sounds so damn funny :D)

Walter - "She tricked my son with her carnal manipulations and he fell right into her vagenda!"