Why would anyone kill a scientist? What did we ever do?

Walter: I think I know what's happening to you. Every relationship is reciprocal, Peter. When you touch something, it touches you. It changes you. When you touched the machine, it changed you, weaponized you.
Peter: So what do we do now, Walter?
Walter: I don't know.

Peter: Besides, they're not even human. I'm not doing anything wrong.
Walter: Then why didn't you tell us? If you weren't doing anything wrong, why didn't you tell us? I don't know what's happened, but this is not you.

Walter: Peter! Do you have any idea how much radiation you're about to be exposed to?
Peter: Well, I do now, Walter.

Walter: It's song lyric. Fauxlivia ruined U2 for all of us.
Nina: Fauxlivia?
Peter: That's what Walter's calling her now. Fauxlivia; as in fake Olivia.
Nina: Aah.

Walter: You have any chewing guy?
Guard: Excuse me?
Peter: I'm sorry, he has this thing with he ears.
Walter: It's not a thing with my ears. It's a blocked Eustachian tube, and it's a perfectly natural reaction. Any flavor will do, although I'm rather partial to grape.

"Every time the Observer shows up, it has something to do with you. And every time; something bad."

"You're just saying that to see if I'm high."

Peter: "Walter, are you all right?"
Walter: "If all right means despondent, then yes."

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