Friends Season 6 Episode 18 : The One Where Ross Dates A Student
Ross starts dating a student from one of his paleontology classes much to his friends amusement, although he has fears about how the relationship may jeopardize his career. Rachel and Phoebe's apartment catches fire causing them to move in with Monica and Joey. At first it appears that Rachel gets to live with Monica and Phoebe is forced to live with Joey when it appears that Phoebe's candles caused the fire. However when it emerges that the fire was actually Rachel's fault, the two switch and Rachel finds herself preferring Joey's easygoing nature while Phoebe chafes over Monica's desire to keep her apartment clean.