Quote from Phoebe in The One with the Jellyfish
Phoebe Abbott: Remember how I said Lilly, Frank and I were close? Well, we were very close. Phoebe: How close? Phoebe Abbott: Well, the three of us were kind of a couple. Phoebe: I don't know even how that would work. Phoebe Abbott: Well, we would- Phoebe: I'm not asking!