Sheldon: I fashioned historically accurate undergarments out of linen.
Leonard: You went out and bought linen?
Sheldon: Don't be silly, I borrowed one of your pillow cases.
Leonard: Borrowed?

Penny: Sheldon, we're getting married.
Sheldon: But you've been engaged for over a year now, and you don't even have a wedding date.
Penny: Well, we will. We're just not in a rush.
Sheldon: Okay.
Leonard: We're gonna set a date.
Sheldon: Okay. If you say so.
Penny: Yeah, it's just, things are good right now.
Leonard: Really good.
Penny: I'm focusing on my job.
Leonard: And we've been busy with our paper.
Penny: So busy.
Leonard: Yeah, we'll pick a date when we pick a date.
Penny: Yeah.
Sheldon: Okay.
Penny: You know, I can see why Amy's mad at you!
Leonard: Yeah, shut up, Sheldon!

Penny: Aw. When he says things like that, I just want to hug him and make everything better.
Leonard: My brother was mean to me, too. Yeah, you probably had it coming.

Dr. Gallo: Sounds like you're holding on to quite a bit of anger towards her.
Leonard: Oh, no, I-I've worked through a lot of that stuff; I'm better now.
Dr. Gallo: Mmm, good for you.
Leonard: Do you know she never let me celebrate my birthday because being born was her achievement, not mine?
Dr. Gallo: That's heartbreaking.
Leonard: Right? To this day, I send her a card every year with a little money in it.

Amy: But it's the one day a year that's just all about you.
Leonard: One day. (Laughs) Right.

Leonard: And that is how a short asthmatic scientist landed a stone-cold fox.

Howard: I'm serious, JPL's actually developing a robot arm that could grab an asteroid before it hits us.
Leonard: So their plan for saving the Earth from Armageddon is hoping a bunch of scientists can catch a ball?

Sheldon: Yeah, but what happens when we each get a peek behind the curtain? I mean, she's never even seen me unshaven.
Leonard: You just shaved yesterday. You're good for three months.

Leonard: Damn. I burped so hard, I died in my game.

Leonard: Don't worry, we won't be doing much sleeping anyway. It's like an all-night party. There's trivia contests and Dungeons & Dragons. As we like to say, it's "off the chain mail."

Leonard: Hey, Olsen twins!
Penny: What?
Leonard: Well, I mean, I'm sitting right here. You're talking about my feelings and somehow leaving me out of the conversation.

Leonard: Hey, what you reading?
Penny: A parenting book.
Leonard: Oh, my God. Are-are we?
Penny: Wha-- No! You think this is how I would tell you?
Leonard: Well (stammering) ... you're sitting there with a book. It felt like anything was possible.

Ira Flatow: So, it has been five years since the discovery of the Higgs boson. What's the next big thing gonna be?
Leonard: Wow, that's hard to say. There's so much going on. We've been collecting tons of data that could revolutionize the way we understand the universe. For instance, there's a particle called a squark, which could prove super-symmetry.
Ira Flatow: That is interesting. Have you found it?
Leonard: What, the squark?
Ira Flatow: Yes.
Leonard: No, no. Wouldn't that be exciting? But we're also looking for the selectron, the gluino and the neutralino.
Ira Flatow: Well, and have you found that?
Leonard: No.

Amy: Well, as much as we've studied the brain, there's still a lot we don't know about dreams and their function. You know, even psychologists are divided on it.
Leonard: Mm, it's true. Freud thought dreams were about sex, Adler thought they were about dominance-
Penny: Then again, mine are just about being married to this little guy.
Leonard: Well, now it's just edging into mockery.

Leonard: I'll give it a go. My ride home with you was hellish.