Sheldon: It says here that up to 80% of new mothers experience baby blues. And that the best thing to do is reassure them that they're doing a good job. Bernadette, you are doing a good job.
Bernadette: Thank you, Sheldon, I'm feeling better now.
Sheldon: Thank you, Internet. I'm telling you, with the right YouTube video, I can give Howard a vasectomy.

Penny: She said not to come. It's gonna be a while.
Amy: (sighs) Well, first deliveries can be slow.
Sheldon: I am starting to rethink the Flash onesie I bought this kid.

Sheldon: Oh, you know. The Lone Star state. That should be its Yelp rating.

Bernadette: You know, I just read that a team at MIT developed a device that helps people read human emotions.
Leonard: And you think we can get those guys to reprogram Sheldon? Cool.

Amy: Sheldon, that's enough.
Sheldon: Oh, yeah, no, fine. Let's just agree that both creations are special in their own way and it is foolish to try and compare them. Although, we didn't need to have sex with Howard for ours, so we win.

Stuart: Nice to see you again, Dr. Hofstadter. I'm, uh, Leonard's friend, Stuart.
Beverly Hofstadter: Nice to see you, too.
Stuart: Hi, I'm Stuart.
Alfred Hofstadter: Ooh, I'm Alfred, Leonard's father.
Stuart: Oh! Oh, hi. Uh, I'm sorry, did you two want to sit together?
Beverly Hofstadter: No!
Alfred Hofstadter: No!
Stuart: I was wondering why the front row was available.

Bernadette: Anybody have anything snarky to say about that? Didn't think so.

Penny: Oh, that's a nice offer.
Zack: You know, we'd make a great team. Or as we say in the menu business, I can't do this without Me N U.
Penny: Right, 'cause it spells "menu."
Zack: Yeah, right? It's funny. I got a lot of menu jokes, but that's my favorite.

Raj: Yeah, this military guy showed up at Howard's door. He was terrifying.
Sheldon: Oh no, what did he say?
Raj: He gave me his business card and asked me to please pass it along to Howard.
Sheldon: That doesn't sound terrifying.
Raj: Not to a white guy born here, no. To a brown guy whose name has a lot of syllables in it - terrifying.

Sheldon: We don't need Howard's cousin, no. We have me.
Leonard: You're not a lawyer, Sheldon, you're just a know-it-all.
Sheldon: I am not a know-it-all. I'm a person who knows lots of things and likes to correct other people when they're wrong.
Leonard: That's the definition of being a know-it-all.
Sheldon: Or in German, a Besserwisser.

Leonard: It's not that I'd stopped trying, it's just how relationships progress. They start with infatuation, but over time mellow into something more comfortable.
Sheldon: Hmm. Yeah, you're right. It's like when I first encountered the Pythagorean Theorem. You know, I was blown away that the square of the hypotenuse was the sum of the squares of the opposite sides. Yeah, but now I'm just like "eh."

Amy: Aww, I remember signing our first Relationship Agreement.
Sheldon: You seem to be forgetting the "no nostalgia" clause.

Penny: It's not that I want to go, I just think it'll make Leonard happy. And if I have to watch him squeeze into an Ewok costume, so be it.
Amy: Look at you, going to Comic-Con, talking about Ewoks. I really have become the cool one around here.

Bert: Okay, well, thanks for coming by. You're nice people.
Penny: Well, so are you. In fact, you know what? We will never take you for granite. Did you get that? Granite? A little geology joke.

Sheldon: I may have lost my guidance system and my girlfriend, but I still have a colon full of yesterday's meals to keep me company. Although, thanks to your high-fiber breakfast, I'm sure that'll be leaving me, too.