Leonard: Hey Stuart.
Stuart: You busy?
Leonard: Um…
Howard: Classified, Leonard.
Leonard: Yeah, it's a regular Manhattan Project.

Stuart: Well, tonight's my date with Penny and since we haven't been able to connect by phone...
Leonard: Yeah, I'm sorry, it's been broken.
Stuart: Or e-mail.
Leonard: Yeah, that too. Everything's broken.
Stuart: Anyway, I was just wondering if you had any last-minute advice.
Leonard: All right, well, off the top of my head, I think the most important thing with Penny is to go really slow. I mean, glacial.
Stuart: Okay.
Leonard: You know, guys come onto her all the time, so, you need to, like, set yourself apart. You know, be a little shy, don't make too much eye contact. And, you know, treat her with, like, cool detachment and, you know, fear.
Stuart: Fear?
Leonard: Yeah, like, you're afraid that if you touch her, she'll break.
Stuart: Well, that plays right into my wheelhouse.

Raj: Okay, look. Instead of trying to reinforce this structure here, what if we just ran another line, bypass it entirely?
Sheldon: It won't work. The diameter of the tubing is insufficient.
Raj: What if we reposition the collection tank?
Sheldon: It won't work. No way to mount it.
Howard: Okay, here's an idea. What if I change my name and go live with my cousin and her husband Avi in Israel?
Sheldon: That could work.

Penny: Morning. What’s up?
Leonard: Nothing. We just pulled an all-nighter trying to fix a zero-gravity ... pasta maker.

Raj: If you really want to clean up your karma, go get my freakin' latte.

Howard: Hang on, I think I've got this. Help me see if we can wedge this little piece of PVC behind the support rod.
Sheldon: You're overestimating the tensile strength of the substructure you're building.
Howard: Sheldon, I know what I'm doing.
Sheldon: If you knew what you were doing, there wouldn't be a space toilet where my coffee table should be.

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.

Stuart: Yeah, last night at dinner, I did what you told me, I went really slow, I kept my distance, and two bottles of wine later, we were making out in my car.
Leonard: Wine? I didn't say to give her wine.
Stuart: It doesn't matter, that's where it all went to hell.
Leonard: During the kissing? What did you do, sneeze in her mouth? I did that to a girl once.
Stuart: No, everything was good and really hot, and I said “Oh, Penny,” and right where she was supposed to say, “Oh, Stuart,” she said ... your name.
Leonard: Leonard?
Stuart: That is your name, right?
Leonard: Yeah, no, yeah, wow, I'm sorry. That must've been the last thing you wanted to hear.
Stuart: Well, it beats "You know I'm a dude, right?" Yeah, it was pretty bad.

Howard: (talking on the phone) Yes, sir, I understand classified. We'll keep it all classified, no one has to know but you and me.
Penny: What's classified?
Leonard: Howard's space toilet. I'll tell you later.

Penny: Leonard, could you pass the soy sauce, please?
Leonard: I'm sorry, were you talking to me?
Penny: Yeah, I said Leonard.
Leonard: Yes, you did, didn't you?

Penny: What the hell is that?
Howard: Meatloaf.
Leonard: What was it doing on the ceiling?
Howard: That's classified.

Leonard: Wait a minute. He offered to send you to the North Pole?
Sheldon: Yes. In fact, he was quite enthusiastic. He said, "Frankly, if I could send you tonight, I would."

Sheldon: I'm not good with cold, Leonard. How often have we had to leave a movie theater because I got a headache from drinking the Icee too fast? I can't go.

Leonard: Sheldon, what are the words I can say right now to end this conversation and let me go back to sleep?
Sheldon: Odd, President Siebert posed the exact same question.
Leonard: How was it resolved?
Sheldon: It wasn't. His wife set the dogs on me, and rendered the question moot.

Sheldon: I need access to the Cheesecake Factory's walk-in freezer.
Penny: Now, honey, I already told you, the hamburger meat is fresh and stored at a safe temperature.