Leonard: What number were you putting in? You don't know my birthday, do you?
Penny: Yes, I do.
Leonard: Well, what is it?
Penny: May.
Leonard: May what?
Penny: I'm not gonna say your password out loud. That is not secure!

Sheldon: Woman, you are playing with forces beyond your ken.
Penny: Yeah, well your Ken can kiss my Barbie.

Raj: [to Amy] If you were having Sheldon's baby, would you really want him in the room?
Penny: Yeah, if he's in the room when they're making the baby, I'll give you $10.

Penny: I mean, who even reads Scientific American?
Leonard: It's kind of a big deal.
Penny: If it's such a big deal, how come the biggest celebrity they could get for the cover is a molecule?

Sheldon: Amy, I excel at many things, but getting over you wasn't one of them. I think I need to just be your friend.

Amy: Let's see. I have been on six dates with three different people. It was either for coffee or dinner. One I met at a bookstore and two I met online. I haven't slept with anyone. The aquarium is 40 minutes away. And there's a baggie of Cheerios for you in the glove compartment.
Sheldon: Uh, regular or honey nut?
Amy: I mixed them.
Sheldon: You mixed them. No wonder gentleman callers are pounding down your door.

Raj: Have you guys seen this feature that lets you talk to Siri without pressing any buttons?
Howard: No. How does it work?
Raj: You just say, uh, "Hey, Siri, what time is it?"
Siri: The time is 6:37 p.m.
Howard: So now anyone can control your phone? Hey, Siri, show me pictures of naked grandma butts.
Raj: Nice try. It only recognizes my voice.
Howard: Oh, cool. (Imitates Raj): Hey, Siri, show me pictures of naked grandma butts.
Raj: I don't sound like that.
Siri: Here are some images of naked grandma butts.