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

Sheldon: Have you notified NASA?
Howard: No. Are you crazy? What am I gonna say? I screwed up your toilet and pretty soon there's gonna be crap floating all over your nice shiny space station?

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.

Howard: Look, I was going over the schematics on my zero-G toilet, and I made a teeny tiny mistake on the specifications for the diverter valve.
Leonard: How teeny tiny?
Howard: It's gonna fail after about ten flushes.
Sheldon: But the mission is for six months.
Howard: Yeah, see, that's the code red. It's kind of like a jack-in-the-box, no one knows exactly when, but at some point something way worse than a puppet is gonna pop out of that box.

Leonard: Well, what are you gonna do?
Howard: I'm gonna figure out how to fix it, then I'll tell them.
Leonard: So, what do you need us for?
Raj: He can't figure out how to fix it.
Howard: Hey, you said you were gonna be supportive.
Raj: I'm trying, but you have to admit this is pretty damn funny.
Sheldon: I agree. It's the juxtaposition of the high-tech nature of space exploration against the banality of a malfunctioning toilet that provides the comic fodder here. Check your messages.

Sheldon: Smell that? That's the smell of new comic books. Oh, yes!
Howard: They're on me today, boys.
Raj: You're paying? Have you been selling your sperm again?

Sheldon: Answer the phone, Leonard.
Leonard: No! There, it went to voice mail.
Sheldon: Aren't you going to check your messages?
Leonard: No.
Sheldon: You have to check your messages, the leaving of a message is one half of a social contract which is completed by the checking of the message. If that contract breaks down then all social contracts break down and we descend into anarchy.

Leonard: Oh. It's Stuart.
Sheldon: You're not going to answer it?
Leonard: He wants to talk about Penny. I don't want to talk about Penny.
Sheldon: You're making an assumption. Perhaps the comic book store is on fire, and he needs your assistance.
Leonard: Why would he call me?
Sheldon: We don't know. And if you don't answer the phone, we can't know.

Penny: Well, In that case, do you mind giving me some advice?
Leonard: About Stuart? Love to.
Penny: He's very shy, how do I make him feel more comfortable around me?
Leonard: Well, uh, first of all, don't underestimate the value of discomfort.
Penny: Really?
Leonard: Well, yeah, Stuart thrives under pressure, that's why he works in a comic book store.

Stuart: Uh, hey, Leonard, can I talk to you about something?
Leonard: Oh, sure, what's up?
Stuart: Remember I went out with your friend Penny a couple weeks ago?
Leonard: Yeah, vaguely.
Raj: Sure you remember. You went to the bar and made a fool of yourself trying to pick up strange women.