Sheldon: Yeah, not to brag, but Amy's last birthday brought my coital tally up to four.
Leonard: Whatever you're doing, it's not bragging.

Leonard: What would you be if you were attached to another object by an inclined plane, wrapped helically around an axis?
Sheldon: Screwed?
Leonard: There you go.

Sheldon: This song is never going to stop. Have you ever dealt with something so relentlessly irritating?
Leonard: That's a trick question, right?

Leonard: Penny, as a scientist, my job is to figure out why things happen. But I don't think I'll ever understand how someone like me could get to be with someone like you. You know maybe I don't need to understand it, I just need to be grateful. I love you, Penny.

Howard: Bernie, this is our kid's name. I think we should both agree.
Bernadette: You're right. We both made this baby.
Howard: Thank you.
Bernadette: And I carried it, had to stay in bed for four months, sacrificed my body and my job, and soon it's gonna burst its way out of me like the Kool-Aid Man.
Howard: Exactly. Fifty-fifty.

Penny: Okay, we're gonna start with some nice breathing exercises. (inhales, exhales)
Bernadette: Sorry. I can't think of anything except how flat your belly is.
Penny: Oh, thank you.
Bernadette: Go put on some more clothes, you bitch.

Amy: I'm trying to get our grant proposal together. Any chance you've finished up those mechanical drawings?
Howard: Oh, sorry. I was gonna do it last night, but I got kind of busy.
Raj: Yeah, you did.
Amy: What are they talking about?
Sheldon: I'll give you a hint. It's something that we have done four times.
Amy: Watched La La Land?
Sheldon: What? No. No. I've not watched La La Land four times. If you find the soundtrack on my phone, that's just 'cause our iTunes accounts are linked.