Penny: No, I've been reading Bernadette's parenting book. It's like the answer key to the Sheldon test.

Leonard: It's fine, I've been driving him for years. What's one more day?
Sheldon: Oh, and I've got a new car game we can play. It's called "What siren am I?"

Penny: Now, why don't you go wash up, and we'll call you when dinner's ready.
Sheldon: Okay. (Sheldon leaves)
Leonard: (surprised) What did you do? Are you a witch?

Leonard: That's amazing.
Penny: I know. But, you know, it's only birth to five. What do we do when he turns six?
Leonard: Take him to the zoo and leave him there.

Sheldon: All right, you ready for your next one? Just a warning, this one's a little annoying. (imitates a high-pitched siren)
Leonard: Let's take a little little break, I'm getting a headache.
Sheldon: Aw, right in the middle of our fun game.
Leonard: Yeah, weird.

Amy: What's with the blinking?
Sheldon: It's Morse code. So we can talk about without hurting --'s feelings.
Amy: Sheldon, I don't know Morse code.
Howard: I do. And if you have something to say, you can say it to my face.

Sheldon: She's going to be home at "eight-ish." Like, when is that? 8:01? 8:02? And what kind of scientist uses "-ish"?

Sheldon: I got you a little something to help you relax.
Amy: Sheldon, that is the sweetest, most- What what is this?
Sheldon: The notes from our quantum cognition project. I thought we could spend the evening grinding away on it.
Amy: (sighs) I just got home, I'm tired.
Sheldon: Of Howard, I know. So how about you and me make some beautiful science together?
Amy: Sheldon, I want to work on this with you, just not tonight. What if we get up early and do it in the morning? I promise, I'll be way more into it.
Sheldon: You know what? There was a time that you would've been happy to stay up and collaborate all night with me. And then wake up in the morning and do it some more.
Amy: (sighs) Fine, but can we make it quick?
Sheldon: No. If you're just gonna make me do all the work, then go to bed. But don't be surprised if you walk out here and catch me doing it myself.

Bernadette: At least he can still clean the oven, so that's something.
Sheldon: Oh, that's what he thinks. Where's your steel wool?
Bernadette: (picks it up from her lap) Right here.
Sheldon: We make quite the team.
Bernadette: Sure do!

Raj: This is great, the two of us hanging out. Why didn't we think of this earlier?
Sheldon: Agreed. I don't need Amy to watch a movie. I can not hold your hand just as easily.
(Sheldon starts the movie)
Sheldon: In the book this is based on, that man's the killer.

Bernadette: Did you do the laundry?
Sheldon: I sure did. Ooh, he's gonna be steamed. Just like his dress shirts.

Amy: Oh, that's Sheldon. Oh, he's upset with Leonard and Penny. (phone whooshes) And Bernadette. (phone whooshes) And Mark Twain?

Raj: I used to have the stuffed raccoon from Guardians of the Galaxy, but Cinnamon licked it raw.
Howard: There's a time and place for your randy dog stories, and it's never and nowhere.

Howard: So this is it?
Amy: Yes. We are using it to map brain wave patterns and then converting them into electrical impulses that can be used to control anything from wheelchairs to robots.
Howard: Based on that ring on your finger, I'd say you're pretty good at controlling robots.
Amy: Careful, that's my fiance you're talking about. And I can program him to hurt you.

Penny: Maybe there's something in the book that will help.
Leonard: Worth a shot.
Penny: Okay. Let's see, let's see. "Biting other children"?
Leonard: Well, sometimes, but problem for another day.