Amy: Rajesh, it's perfectly normal to have doubts after breaking up with someone.
Raj: Well, you really think so?
Sheldon: Yeah, you know what's not normal? Blubbering about emotions during a flag show. Unless that emotion is excitement over New Zealand changing their flag. Yeah, good luck, you crazy Kiwis, we're rooting for you.

Sheldon: Please, all comments and questions should be flag-related.
Barry Kripke: All right. Is my pole flag-related?
Sheldon: I don't see why not.

Howard: Maybe that's an idea, guidance systems for drunk people.
Raj: They have that. It's called Uber.

Leonard: I'm not seeing anyone using liquid helium vortices like this.
Howard: I'm not finding anything either.
Raj: That's a good sign.
Sheldon: Oh, wait, I found something.
Howard: Damn. What is it?
Sheldon: This video. The baby panda sneezes, and the mama panda gets so scared.

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

Amy: You realize none of those things would happen now?
Sheldon: I do, but why do you care if I celebrate my birthday at all?
Amy: Well, you made my last birthday so memorable, I wanted to return the favor.

Penny: You know, if you had a party now, you have plenty of friends that would love to come.
Leonard: And we live here, so we have no choice.
Penny: Yeah.

Penny: So, hows it goin'?
Leonard: Good. Slow.
Howard: There's a lot of tedious setup, but once we get through that it should go quicker.
Penny: Is there anything we can do to help?
Leonard: You know what, this part isn't that technical. You actually could.
Penny: Wow, really? Called my bluff. All righty then.

Sheldon: Look at the 4K resolution. Next time we Skype, I'm gonna count all those nostril hairs.
Amy: Or you could just look into my eyes.
Sheldon: But you only have two eyes. You got a lot of nostril hairs.

Raj: Okay, that's cool. I guess everybody's involved in this project but me. So, see ya.
Bernadette: I feel bad. Should we have asked him to stay?
Raj: (From outside) Yes.

Penny: You know, there's a cabin in Big Bear that a doctor I work with keeps offering me.
Leonard: Because he's hitting on you?
Penny: She.
Leonard: Oh, good.
Penny: But I could get her.

Bernadette: Thank you for this. You know, ever since people found out I'm having a baby, I feel like I became Pregnant Bernadette. It was nice to take a little break tonight.
Sheldon: I can understand that. From the moment people realized I was a genius, I've been Sheldon the Genius. Although I've never really wanted a break from that, so I suppose I don't understand. Which is ironic, 'cause, you know, genius.

Alfred Hofstadter: Now, one of the more exciting things to be found recently is that Neanderthals and Homo Sapiens frequently mated with each other.
Mary Cooper: Well, that certainly explains my marriage to Sheldon's father.
Sheldon: That's funny because my father was not a very clever man.
Amy: I'd be lost without you.

Leonard: What is happening there?
Sheldon: I think it's pretty obvious. They don't want dessert 'cause they filled up on bread.

Leonard: And you promise you're okay with everything from the car?
Penny: Oh my God, Will you stop bringing it up?
Leonard: You're right. I'm sorry. We have the rest of our lives to dredge up stuff from the past and fight about it.