Quote from Phoebe in The One After the Superbowl (Part 1)
Rob Donan: The kids loved you. Phoebe: Yea. I rock. Rob Donan: And you know why? Because you told the truth and nobody ever tells kids the truth. You were incredible. Phoebe: But? Rob Donan: How did you know there was a "but"? Phoebe: I sense these things. It was either "but" or "butter."