Sheldon: Let's take this problem one step at a time. First, we need to decide whether we're calling it lee-ver or lev-er.
And the sooner we decide it's lee-ver, the sooner we can roll up our slee-ves - and not sle-ves - and get to work.
Leonard: We're going to be here for ee-ver.

Penny: Why am I so nervous?
Bernadette: It's understandable. Amy was afraid to tell her mom she broke up with Sheldon.
Penny: Yeah? How did it go? Did she make you crawl into the breaking-up drawer?

Leonard: Hey, watch your speed. I hear the Mexican police target tourists.
Howard: Oh, not a problem. If anything goes down, we just put Koothrappali in the driver's seat and slap a sombrero on his head.
Raj: Dude, how many races can you offend in a single breath?
Howard: I don't know. Have you watched the Olympics with me?

Sheldon: Would you pass the mustard.
Leonard: Sure. Hey, you wanna hear a fun fact about mustard?
Sheldon: Is it that the glucosinolates that give mustard its flavor were evolved by the cabbage family as a defense against caterpillars?
Leonard: Yeah.
Sheldon: Well, that was fun. Good for you, Leonard.

Leonard: This was Feynman's van? This is so cool.
Raj: Yeah, nothing's been changed since he drove it.
Howard: Bet he picked up a lot of cute grad students in this bad boy.
Sheldon: And talked about physics with them.

Raj: Hey, look! The lug nut's off.

Raj: What's wrong with Mexico?
Sheldon: Uh, Mariachi bands, wild dogs, beans that jump around because there's a worm inside.

Sheldon: Are we all up to date on our yellow fever inoculations?
Howard: You don't need a yellow fever shot to go to Mexico.
Sheldon: You can never be too careful. I got one last year before I went to Epcot.

Leonard: Sheldon, can you believe that we're driving in a van that was owned by one of the greatest scientific minds of the 20th century?
It's like the Batmobile. If Batman was real and a physicist and his car wasn't cool.

Howard: We are going to Me-he-co.
Leonard: Fun! I've never been there.
Sheldon: Leonard, don't be fooled. I'm from Texas. Me-he-co is Spanish for Mexico.

Wyatt: I've been sitting on a little news myself.
Penny: Well, what is it?
Wyatt: You know that rototiller I got for the tractor?
Penny: No.
Wyatt: Oh, you should see it. It is a beautiful piece of machinery. Anyway, uh, I backed over your pet pig with it.
Penny: Moondance?
Wyatt: Yeah, he's, uh, not dancing anymore.
Penny: You killed my pig?
Wyatt: I did not kill him. The vet took care of that.
Penny: When?
Wyatt: Oh, ten, twelve months ago.
Penny: You didn't tell me for a year?
Wyatt: Well, apple doesn't fall far from the tree, does it? Love ya, slugger. Gotta go.