Leonard: So, are you going to give us a clue where we're headed?
Raj: Okay. Let's see. They've got spicy food and there's a chance you'll get diarrhoea.
Leonard: India.
Raj: We can drive there.
Leonard: Your house?

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.

Penny: What are you doing back?
Leonard: We got a flat and couldn't get the tire off.
Penny: Oh, I'm sorry.
Leonard: Thank you.
Penny: If it makes you feel any better, I pierced Amy's ears and her mom made her sit in my closet.
Sheldon: We blew up Feynman's van.
Penny: My dad killed my pig with his tractor.
Leonard: I spent the night in Mexico with Sheldon.
Penny: You win.

Amy: Uh, well, actually, to be honest I haven't told her yet.
Penny: You've been giving me a hard time and you haven't even told your mom about Sheldon?
Amy: I'm feeling a little dizzy from all the blood loss. I don't know what you're talking about.

Penny: Thanks a lot, guys.
Bernadette: What did we do?
Penny: Before I made that call, my pig was alive and happy and rolling around in the mud. Now he's illegally buried in our backyard next to my great-grandmother.
Bernadette: Really? They didn't eat him?
Penny: No! He was a beloved member of the family.
Bernadette: The breakfast meat family?