Quote from Phoebe in The One with Joey's Big Break
Ross: Will you please tell me what it is that made you so mad at me? Phoebe: I don't know. I don't remember. Ross: If you can't remember, can't we just forget about this? Phoebe: Oh, no. I am mad at you. I know that much. But I am sorry about the fat-ass thing because you actually have a very sweet, little heinie.