Pheebs, you think it would be okay if I asked out your sister? ...
Joey: Pheebs, you think it would be okay if I asked out your sister?
Phoebe: Why? Why would you wanna do that?
Joey: So that if we went out on a date, she'd be there.
Phoebe: Well, I mean, I'm not my sister's, you know, whatever, and um... I mean, it's true, we were one egg, once, but er, you know, we've grown apart, so, um... I don't know, why not? Okay!