Raj: Howard, wait. Why don't you use this instead of the PVC to keep the transverse filter assembly in place?
Howard: Because this is not a spare part from the space station. This is the thing from the pizza box that keeps the lid from touching the cheese.
Raj: That what that's for? In India, the lid just touches the cheese. Of course, we also have rampant poverty and periodic outbreaks of cholera, so a little cardboard in our cheese is no biggie.

Howard: Okay make your little jokes, but out of the four of us, I'm the only one who's making real world contribution to science and technology.
Rajesh: He's right, this is an important achievement for two reasons. Number one and of course number two!

Sheldon: You know I'm in such a good mood I'm actually finding your tenuous grasp of the English language folksy and charming today.

Leonard: What were you doing at Penny's?
Sheldon: Well, we had dinner, played some games, and then I spent the night. Oh, and you'll be happy to know that I now have a much better understanding of 'friends with benefits.'

Penny: Alright, Sheldon, let's just calm down and we'll call the building manager, he'll come open your door, you just eat your dinner here while you're waiting.
Sheldon: Eat? My dinner? In your apartment?
Penny: Yeah, why not?
Sheldon: Sure, why not? And after the sun's down we can all pile in my pick-up and go skinny-dipping down at the creek. 'cause today's the day to stop making sense.

Howard: Okay, are you from Star Wars universe?
Leonard: Yes.
Howard: Were you in the original trilogy?
Leonard: Yes.
Howard: Is there a picture of you in my wallet wearing a metal bikini?
Leonard: God, I hope not. And no, I'm not Princess Leia.

Wolowitz: Raj, there's no place for truth on the Internet.

Raj: What's wrong with you dude, that woman was all up in my jammy.
Leonard: Okay, I hate to break this to you and whatever your jammy is, but, I'm pretty sure she is a prostitute.
Raj: What? No.
Leonard: Okay, let me put it this way, in your entire life, how many gorgeous women have walked straight up to you in a bar and asked if you wanted to party.
Raj: Maybe I can save her.
Leonard: Maybe, but I'm guessing it will cost you about $500 an hour to try.
Raj: It was lovely meeting you, best of luck in your future endeavors.

Leonard: Hey, Sheldon, are you coming?
Sheldon: I'd rather have a blowfly lay eggs and hatch larvae in my auditory canal.

Penny: Mmm, what smells so good?
Sheldon: That is the intoxicating aroma of Kadhai Paneer. A perfect culinary representation of the freedom this evening holds. Not only is it Indian cuisine, which Koothrappali loathes, it contains a generous helping of peanuts, which would reduce Wolowitz to a wheezing 97-pound blister. And finally, its main ingredient is paneer, a farmer's cheese that would cause Leonard to render any room uninhabitable within minutes.

Sheldon: So, how was your day?
Penny: Are you trying to make small talk? Oh, sweetie, you really don't have to.
Sheldon: No, it's the accepted convention. How was your day?
Penny: Well, uh, they shifted my schedule around at the restaurant so my hours are going to be a little different...
Sheldon: I'm sorry, that's not going to interest me at all, just eat.

Leonard: Look, imagine you maintained a friendship with someone you had sex with, but you were free to date whoever you wanted.
Sheldon: I'm sorry, I can't imagine any of that.

Raj: What do you say, Howard?
Howard: I say Vegas baby!
Raj: What are you gonna tell your mother?
Howard: Sea World baby!

Hooker: What's your name?
Raj: Rajesh Ramayan Koothrappali.
Hooker: Hello Rajesh Ram...Hello Rajesh.

Sheldon: We have a bowl. Our keys are in the bowl. You should get a bowl.
Penny: I just don't understand; how can beautiful mind of Sheldon Cooper forget his keys in the first place?
Sheldon: I left them in the bowl.