Bernadette: Apple slices? What kind of lunatic goes to McDonald's and gets fruit?

Amy: Sheldon, your mother's an attractive woman. You need to get used to the fact that men are going to be interest in her.
Sheldon: Well, and you need to drive the car and mind your business.
Amy: I will not have you be disrespectful to me.
Sheldon: What- you're not my mother.
Mary Cooper: Don't you be disrespectful to her.
Sheldon: Yes ma'am.
Mary Cooper: You'll get there. You've just gotta put some zing on it.

Penny: Well, it's like that science thing. For every action, you have a gigantic and annoying reaction.
Leonard: Just when I thought you couldn't get any hotter.

Raj: Maybe there are other things we have in common. Come dinner-time, do you enjoy eating food?

Leonard: He really worked with the Drug Enforcement Agency?
Penny: He didn't know it 'til he was cuffed, but yeah.

Althea: Now I see three of you. Do we know the father, or is this some Mamma Mia nonsense?

Raj: What's the worst that could come of this meeting?
Howard: I don't know. They take the invention away, and I get nothing?
Raj: Okay, that's not so bad. You know what happened to the scientists that worked on the Manhattan Project? The government forced them to move to the desert. They had to live in secret, and when Oppenheimer objected to what they made him do, they destroyed his reputation.
Howard: What's the point of that story?
Raj: I just read a book about Oppenheimer, seemed like a chance to show off.

Penny: Do they know why the pipes burst?
Amy: They didn't say.
Leonard: Buildings that have a combination of copper and galvanized steel are susceptible to pinholes and corrosion caused by the mobility of ions in the water. Can't have your head shoved in a toilet as much as I did and not pick up a few things about plumbing.

Sheldon: Stuart, wait. I do know what it feels like to be left out.
Bert: I know how it feels, too.
Sheldon: All right, this is about me and him; you're not part of it.

Penny: The new neighbors are weird.

Leonard: Never leave a belt on the floor. At night, they look like snakes.

Sheldon: I knew we should've never mentioned us living together in the first place.
Amy: She was gonna find out eventually.
Sheldon: Disagree. We've known about evolution since 1859. She still believes in Noah and his amazing zoo boat.

Bernadette: What's so funny?
Howard: Raj is looking for a cheap place to live, and I wrote "India."
Bernadette: Don't post that; be supportive.
Howard: Maybe you should be supportive of my hilarious jokes.

Leonard: I would pull this car over and kick you out, but if Penny dumps me, you're all I got.

Howard: The kid with the two shirts screwed us again.