Joey's financial needs aren't being met by his job at the coffee house, so he looks into participating in another medical study. The only one available is for identical twins, but it pays so much that Joey can't resist. He hires another actor to play his twin brother. Rachel and Phoebe are taking a self-defense class, but Ross feels they don't have Unagi, a state of total awareness, in which you can be prepared for any danger. He startles them in the hallway to prove his point, which sets off an on-going competition of psuedo-attacks. Chandler and Monica plan to celebrate Valentines day (late) by making gifts for each other. Chandler can't make anything and Monica forgets until the last minute, so each scrambles to come up with something.
Ross: Well, 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?
Joey: Well, how about this one: Testing the effects of Joey Tribbiani on attractive nurse receptionists?
Receptionist: We already go the results back on that one, and they're not good.
Ross: You know what? She'd love this. Uh, it's an exact replica of Apollo 8. I made it in the sixth grade.
Chandler: Yeah, I guess I could use that. I could say that "your love sends me to the moon."
Ross: Yeah, yeah, except Apollo 8 didn't actually land on the moon. But you... you could write that, umm, "your love lets me orbit the moon twice and return safely."
Ross: I tried attacking two women. It did not work.
The Instructor: What?
Ross: No, I mean... it's okay, I mean, they're... they're my friends. In fact, I, I, I was married to one of them.
The Instructor: Let me get this straight, man. You attacked your ex-wife?
Ross: Oh, no! No, no! No, I tried. But I couldn't. That's why I'm here. Maybe we could attack them together?