Quote from Phoebe in The One Where Rachel Tells...
Ross: Well, we said we'd just do it that one time but now I think she may wanna start things up again. Joey: Yeah, I don't think that's what it is. Ross: Why? What else could it be? Joey: Oh, wow, I don't feel well. Ross: I'm telling you, that's what it is. No wonder she was looking at me funny at the wedding. She didn't say anything to you? Phoebe: [to Joey] Maybe it's something you ate.