Joey has a one night stand and wants Rachel to dump the girl (Erin) for him. Not only can't Rachel do it, but she and Phoebe become friends with Erin and arrange for Joey to go out with her again. Joey decides he really likes Erin, but Erin decides there isn't a future in the relationship. Ross discovers that his Doctoral Thesis is in NYU's library. When he goes to visit it, he finds that it's in a remote corner frequented by couples engaging in sexual activities. He begins to patrol that area of the library, but ends up being a culprit himself. Monica runs into Janice, who invites herself to Monica and Chandler's wedding.
Ross: Excuse me. Hi, I'm a professor here. Do you know the Paleontology section, fifth floor, stack 437?
The Librarian: Well, yes! Just give me five minutes, I just have to find someone to cover my shift.
Ross: No! No! No! Can I speak to someone in charge please?
Rachel: Wow. Well, I guess it wasn't Cupid who brought her here.
Phoebe: No, just a regular old flying dwarf.
Ross: I'm a professor here, uh, Ross Geller.
Woman: Ross Geller, why do I know that name? It's, uh.... Wait! Did you write this?
Ross: Yes! You're the person who checked out my book!
