Sheldon: Thanks for carving a smiley face in my grilled cheese sandwich.
Mary Cooper: Well, I know how to take care of my baby. His eyes came out a little thin, but you can just pretend he's Chinese.

Mary Cooper: If you recall, when you were little we sat right here at this very spot and talked about some of the problems you had getting along with the neighbor kids.
Sheldon: That was different. They were threatened by my intelligence and too stupid to know that's why they hated me.
Mary Cooper: Oh, baby. They knew very well why they hated you.

Mary Cooper: There's no alcohol in this household. Stop talking like that. And lose the hat.

Mary Cooper: Raj is it? Still having trouble talking to the ladies? Because you know at our church we have a woman who's an amazing healer. Mainly she does crutch and wheelchair people. But I bet she'd be willing to take a shot at whatever third-world demon is running around inside of you.

Mary Cooper: Don't tell me prayer doesn't work.

Penny: Leonard, you're back.
Leonard: Yeah, I just stopped by to say… [Penny grabs Leonard and kisses him] Yeah, so, hi!
Penny: Hi! [They stumble into her apartment while kissing]

Leonard: Hey. Listen, since we got, you know, interrupted last night, I didn't have a chance to give you this.
Penny: Oh, Leonard, you shouldn't have. Oh, boy! What is it?
Leonard: It's a snowflake. From the North Pole.
Penny: Are you serious?
Leonard: Uh-huh. It'll last forever. I preserved it in a one percent solution of polyvinyl acetal resin.
Penny: Oh, my God. That's the most romantic thing anyone's ever said to me that I didn't understand.
Leonard: It's actually a pretty simple process. You see, cyanoacrylate are monomers which polymerize on... [Penny kisses him]