Sheldon: I'm sorry, coffee's out of the question. When I moved to California I promised my mother that I wouldn't start doing drugs.

Sheldon: You are effectively paying yourself five dollars and nineteen cents a day.
Penny: A day?
Sheldon: There are children working in sneaker factories in Indonesia who out-earn you.

Sheldon: Camouflaging bald spots. That's primarily a male concern. Perhaps we could expand our market.
Penny: How are flower barrettes going to appeal to men?
Wolowitz: We add Bluetooth.

Penny: Since when do we offer one day rush?
Leonard: Amazon offers one day rush.
Penny: Yeah, but they don't have to glue the books together!

Sheldon: Penny, I'm a physicist. I have a working knowledge of the entire universe and everything it contains.
Penny: Who's Radiohead?
Sheldon: I have a working knowledge of the important things in the universe.

Sheldon: Everything is better with Bluetooth.

Wolowitz: Oh, stop it with the fake third world crap. Your father is a gynecologist and you had a house full of servants.
Raj: We only had four servants, and two of them were children.

Sheldon: All right, are you familiar with the development that resulted from Honore Blanc's 1778 use of interchangeable parts? The assembly line, of course.
Penny: Okay, you know what, if I'm not allowed to be snide, you're not allowed to be condescending.
Sheldon: That wasn't a part of our original agreement, and I do not agree to it now.
Penny: All right, fine. How are we supposed to set up machines and conveyor belts in my apartment?
Sheldon: You're thinking of the moving assembly line, an understandable but not excusable mistake. No, the moving assembly line, that was introduced by Henry Ford in 1908. That innovation is what made possible our modern consumer culture by enabling a low-unit cost for manufactured goods. I guess that isn't one of the topics discussed on your Radiohead.

Sheldon: When I signed for this package, I was deputized by the United Parcel Service, and entrusted with its final delivery. I now need you to acknoweldge receipt of the package so I'm fully indemnified and no longer liable.
Penny: Sheldon, it's just a box of rhinestones.
Sheldon: Well, the content are irrelevant. A legal bailment has been created. Does that mean nothing to you?
Penny: It means nothing to anybody.

Sheldon: Bailment describes a relationship in common law where a physical possession of personal property, or chattels, is transferred from one person, the bailor, to another person, the bailee.
Penny: Yeah, yeah, yeah, yeah. Look, look, look. I started a business.
Sheldon: Obviously, not a cleaning business.

Howard: Hey, you know what'd be a great idea? We get some girls over here and play Laser Obstacle Strip Chess.
Leonard: Believe me, Howard, any girl who would be willing to play that, you don't want to see naked.
Howard: You underestimate me.

Penny: Well, it's a little juvenile. I mean, it kind of looks like the MySpace page of a 13-year-old girl.
Leonard: No, it doesn't.
Howard: Please, Dateline could use it to attract predators.

Howard: Too bad. You know the rules of Secret Agent Laser Obstacle Chess. Leonard died again, Sheldon. You're up.
Sheldon: Despite my deep love of chess, lasers and aerosol disinfectant, I must forfeit.
Leonard: Why?
Sheldon: Because it's almost eleven o'clock.
Leonard: So?
Sheldon: So ... Penny has a don't knock on my door before eleven o'clock or I punch you in the throat rule.

Penny: Sheldon, don't you get it? If this takes off, I won't have to be a waitress anymore.
Sheldon: But then who will bring me my cheeseburger on Tuesday nights?
Penny: Another waitress.
Sheldon: What's her name?
Penny: I don't know.
Sheldon: And you're going to let her handle my food?
Penny: Nancy. Her name is Nancy.
Sheldon: I think you're just making that up.
Penny: Sheldon, I'm sorry about your hamburger, okay? I just don't want to be a waitress for the rest of my life.
Sheldon: Cheeseburger. I get a cheeseburger.
Penny: Fine, cheeseburger.
Sheldon: Maybe I'd be better off with Nancy.

Sheldon: All right, ten dollars a day times five days a week, times 52 weeks a year is two thousand six hundred dollars.
Penny: That's all?
Sheldon: Before taxes.
Penny: Well, I don't have to pay taxes on this stuff.
Sheldon: I believe the Internal Revenue Service would strongly disagree.