Joey: Did you think about the trail?
Ross: What trail?
Joey: The trail from the woman you did it with... to the woman you hope never finds out you did it! You always have to think about the trail!
Ross: I don't... I don't think there's any trail.
Chandler: Okay, okay... Chloe works with that guy Isaac... Isaac's sister is Jasmine and Jasmine works at the massage place with Phoebe... Phoebe's friends with Rachel, and that's the trail! (gleefully) I did it!