Leonard: Can't believe it. Sheldon loves telling on people when they break the rules.
Penny: Yeah, well, maybe he's changed.
Leonard: He hasn't changed. Last week, when the vending machine gave me two bags of chips, he called my mom.
Penny: Well, that didn't ruin your life.
Leonard: Well, it ruined my day. I had to talk to my mom, who, by the way, is-is polyamorous now, so that's fun to think about.

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.

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.

Leonard: My point is, while you're spending all this time on your own, building computers or practicing your cello, what you're really doing is becoming interesting. When people finally do notice you, they're gonna find someone a lot cooler than they thought. And for those of you that were popular in high school, it's over, sorry. Thank you. Congratulations.

Sheldon: Are you all right? You seem distracted.
Amy: Yeah, sorry. I'm just trying to figure something out.
Sheldon: Is it what to get me for our anniversary? 'Cause I'll give you a hint: it's already in my Amazon basket. Just click "buy now." I filled out the gift card for you. Apparently, I'm the light of your life.

Sheldon: So I was talking to my mom about our Pemberton and Campbell situation.
Amy: Really? What'd she say?
Sheldon: Apparently, Old Testament God would bring down his wrath on them for being deceitful, but New Testament God would forgive them.
Amy: So couldn't we just bring down our wrath and ask the New Testament God to forgive us?
Sheldon: You know, I asked her that very question.
Amy: And?
Sheldon: She said I was full of California sass.

Barry Kripke: Oh God, I hate that guy.
Sheldon: That's strange; you seem quite fond of him.
Barry Kripke: I was only being polite. Pemberton is a grade A weasel.
Sheldon: How do I know you're not just being polite when you say it's nice to see me?
Barry Kripke: I have literally never said that to you.