Quote from Rachel in The One with the Holiday Armadillo
Ross: Hey, I just found out. I get Ben for the holidays this year. Rachel: That's great. Monica: Are you gonna dress up as Santa? Ross: Nope. I mean, I know Susan does every year. But I think I want to take this year to teach him about Hanukkah. Phoebe: And maybe I could teach Ben about the Christmas skull and how people die. Rachel: You may need to use this year to teach Ben about Phoebe.