After they watch the prom video, and Rachel kisses Ross, Phoebe says, "See! He's her lobster!"
Also, there's one where Ross and Rachel are fighting, and I can't remember what she says to him, but he sniffs a couple of times like he's going to cry, and then yells, "Fine by me!!!" DH does that one all the time.
Oh, and when Rachel is interviewing for the job at Bloomingdale's, and Phoebe says, "It's like the mother ship calling you home."
That show is full of great lines. The Thanksgiving episodes were the best, esp. the one with the football game, and the one with Brad Pitt.