Bernadette: I should probably keep this in case we have a girl.
Raj: Oh, that's a nice one. Was it yours when you were little?
Bernadette: My dad built it for me.
Raj: Wow, it's so cute.
Bernadette: This was the husband and this was the wife. They'd go out on adventures together. Cruises, skiing, horseback riding. That was really me just duct taping them to our dog.
Raj: Oh, and did they have kids?
Bernadette: They did, but the mommy and daddy didn't like them, so they shipped them off to an orphanage I made out of a shoebox.
Raj: Yeah, that's not worrisome at all.

Howard: I'm sorry I didn't take you to the airport. I just want you to know I'll never forgive myself for being so selfish. And I promise to keep you close for the rest of my life.
Bernadette: Oh, no, that thing's gonna end up in my bedroom.

Bernadette: Gosh, Amy. I'm sensing a little hostility. Is it maybe because like Sheldon's work, your sex life is also theoretical?

Bernadette: (Shouting from the bathroom) How many times do I have to tell you to replace the toilet paper when it's empty?
Howard: I'm in the middle of something.
Bernadette: So am I!

Sheldon: No, I know, but plenty of things are addictive after a single exposure. I mean, crack cocaine, nicotine, Pringles. You know, once one pops one just can't stop.

Howard: It's pretty late. You think I've got time to run some more simulations on the cooling system?
Leonard: Sure, I'm still figuring out the thermo-acoustic expander.
Sheldon: Oh, while you do that I am going to pump cerebral spinal fluid through my brain cells to remove the metabolic by-products of the day's thoughts.
Howard: What?
Sheldon: It's called sleep and it's my bedtime. Nighty-night, y'all.

Penny: Now Sheldon's popular? What is happening?!