Season 4: Episode 79: The One With The Dirty Girl
Chandler buys Kathy a rare copy of her favorite book "The Velveteen Rabbit" for her birthday. When Joey shows everyone his gift for Kathy, a pen that tells time, Chandler T that he can't let Joey give her a gift that's not as great as the one he got for her. Ultimately, Chandler has Joey give Kathy the book, but she knows who really bought her the special gift. Meanwhile, Monica borrows money from Phoebe so as to get her catering business off the ground. When she has trouble collecting the payment, Phoebe confronts the client for Monica -- the two realize that they make a great team. Rachel strives to finish a crossword puzzle all by herself, but really gets her answers by asking the gang random questions. Ross falls for a beautiful paleontologist -- that is until he discovers that she's a slob.