Sheldon: Third barrier passed. You have won the right to see your room. Huzzah!
Leonard: Is this it?
Sheldon: No, this is my room. People don't go in my room.
Leonard: So where do you sleep?
Sheldon: I don't understand.
Leonard: If people don't go in there, and you're people, and… You are people, aren't you? Making a joke.
Sheldon: Do you do this often?
Leonard: On occasion.

Leonard: Do I get some sympathy now?
Penny: A little bit. Okay. Let me get this straight. You move in with this guy, he makes you sign a ridiculous roommate agreement, then he walks into your bedroom while you're doing this Joyce Kim, and you still stay?
Leonard: Actually, I couldn't get too mad at him about Joyce Kim.
Penny: Why not?
Leonard: Well, I was doing some government research at the time, you know, military, rocket fuel. It's kind of secret.
Penny: What does that have to do with Joyce Kim?
Leonard: As it turns out, she was a North Korean spy. Luckily, Sheldon drove her out before I revealed anything important. Which I'm not saying I would have.

Leonard: Dr. Cooper?
Louis: No, you want the crazy guy next door.

Leonard: Two degrees, Sheldon. I just want to turn the thermostat two degrees.

Leonard: Hi-lo. Oops. I started to say hi and then I switched to hello in the middle. It came out hi-lo. Duh. Uh, it's nice to meet you. I've read both your books and most of your papers. I'm Leonard, I live here. You're brilliant.
Sheldon: I apologize. He's only an experimental physicist.
Elizabeth: No need to apologize. Some of my best friends are experimental physicists. Well, not my best friends, but I know them. My best friend is a molecular chemist named Wendy. I'm sorry, I'm rambling. Hi-lo.

Sheldon: I must say, I'm shocked by this betrayal.
Leonard: I didn't betray Penny.
Sheldon: Not Penny, me!
Leonard: How am I betraying you?
Sheldon: Elizabeth's my friend, and you're playing with her!
Leonard: Yeah, I guess I did.

Penny: Is there anything else?
Leonard: Yeah, don't let Goofy near him. He'll have nightmares and I'll have to deal with it.
Penny: What's the problem with Goofy?
Leonard: Wish I knew. He's fine with Pluto.

Penny: He's such an angel when he's asleep.
Leonard: Yeah. Shame he has to wake up.
Penny: I think we can do it.
Leonard: Smother Sheldon in his sleep? Wouldn't that be wrong?

Leonard: All right, maybe I overreacted. So we're in two different places emotionally. So what? And maybe I'm a little ahead of you. That's fine. You know. In fact, it makes sense, 'cause let's face it, I've been in this relationship two years longer than you.

Sheldon: What self-important preening fraud are they honoring this year?
Leonard: I'm so glad you asked it like that. You!

Sheldon: Where are my pants?
Leonard: You might wanna check out YouTube.

Sheldon: Oh Lord, this can't be more humiliating.
Leonard: No, no, no, give him a minute.

Leonard: *Doing Mr. T impression while holding a action figure of Spock with Mr. T's head* I pity the fool who's illogical!

Leonard: What was that?
Penny: Sheldon tried to steal the ring so I punched him.
Leonard: That's my girl!

Leonard: No. But there is an original final draft Ghostbusters script with actual slime stains! (Raj whispers to Leonard) Oh, you're right, it's Ghostbusters 2. Never mind.