Ross: Danger! Danger!
Rachel: What the hell was that?
Ross: A lesson in the importance of unagi.
Phoebe: You're a freak!
Ross: Perhaps. Now, I'm curious. At what point during those girlish screams would you have begun to kick my ass?
Rachel: All right, so we weren't prepared.
Ross: I'm sorry I had to take such drastic measures to make my point, but I just want you guys to be safe.
[Monica opens the apartment door to take out the trash]
Ross: Danger! [Monica walks by unfazed] Ah, huh? Unagi.

Ross: All I'm saying is, it's one thing being prepared for an attack against, like, each other. It's a whole other story being prepared for an attack, like, I don't know- A surprise! All right, you knew that was coming, but that doesn't mean you have unagi.
Rachel: Ooh, you know what, if we made reservations, we could have unagi in about a half-hour.

Phoebe: Yeah, now we can kick anybody's ass.
Ross: After one class? I don't think so.
Rachel: You want to see me self-defend myself? Go over there and pretend you're a sexual predator. Go on, I dare you.
Ross: Of course you can defend yourself from an attack you know is coming. That's not enough. Look, I studied karate for a long time. And there's a concept you should really be familiar with. It's what the Japanese call unagi.
Rachel: Isn't that a kind of sushi?
Ross: No, it's a concept.
Phoebe: Yeah, it is. It's freshwater eel.
Ross: All right, maybe it means that too.
Rachel: Oh, I would kill for a salmon skin roll right now.
Ross: Fine, get attacked. I don't even care.