[After Chandler fools around with one of Joey's sisters.]
Phoebe: How can you not know which one?
Rachel: I mean, that's unbelievable.
Monice: I mean, was it Gina?
Ross: Which one is Gina?
Rachel: Dark, big hair, with the airplane earrings.
Monica: No, no, no, that's Dina.
Chandler: You see, you can't tell which one is which either!
Phoebe: How can you not know which one?
Rachel: I mean, that's unbelievable.
Monice: I mean, was it Gina?
Ross: Which one is Gina?
Rachel: Dark, big hair, with the airplane earrings.
Monica: No, no, no, that's Dina.
Chandler: You see, you can't tell which one is which either!
[After Chandler fools around with one of Joey's sisters.]
Phoebe : How can you not know which one?
Rachel : I mean, that's unbelievable.
Monice : I mean, was it Gina?
Ross : Which one is Gina?
Rachel : Dark, big hair, with the airplane earrings.
Monica : No, no, no, that's Dina.
Chandler : You see, you can't tell which one is which either!
http://www.tv-quotes.com/shows/friends/quote_3018.html