Monica: Phoebe, don't worry about it. I'm sure she wants to live with you.
Phoebe: You're sure? You're absolutely sure?
Monica: Well, no, but I'll bet she probably does.
Phoebe: Oh, probably? Yeah, I don't like that word. I know what "probably" really means. Yeah, uh-huh, yeah. "Oh, your mom probably won't kill herself." I'm sorry, but I'm not hanging all my hopes of Rachel and I living together on "probably." You know, you gotta take care of yourself in this world. History teaches us nothing.