Quote from Phoebe in The One with the Birthing Video
Phoebe: So how does Mona feel about you and Rachel living together? Ross: Oh, I'm actually on my way to tell her right now. Yeah, she's been away all week visiting her parents, but she'll be cool. I mean, she's been so supportive. She even got the baby a tiny T-shirt that says "Fossils are my friends." Phoebe: Come on, Mona. Don't kiss ass.