 A strange man has been in the bar all day and is giving everyone, especially Carla, the creeps. He just sits there, drinks coffee, scribbles some notes every once in a while, and watches the gang. Increasingly, they all get paranoid. Could he be a spy? Could he be a detective? Could he be a detective spying on one of them? Everyone thinks he is a detective but that he is spying on anyone else but him/herself. Finally Sam is about to confront the guy and throw him out of the bar, when Diane confesses that "Irving" is a friend and classmate of hers, in the bar to conduct an experiment for her on paranoia. Introduce a foreign element into an established secure setting and see what happens. The gang don t take too kindly to Diane s confession and imply that they will get even with her. It s a few days later and they haven t struck yet. Diane is jumpy, thinking the most innocent gestures are the act of revenge. She strikes out at customers. She destroys a gift of a muffin from Woody thinking it s tainted. She calls in Frasier to help her through this, not for counseling for her paranoia, but to spy on them. And finally when a camera crew from a public television program comes to interview her, she makes a mockery of herself and the show, thinking again that this is the act of revenge. It ends up not, the show is aired, and Diane is humiliated. But Diane is now not only paranoid and humiliated, but hurt. She feels that by them not carrying out their revenge, they still see her as an outsider to the group. It is then that their plot is carried out, a plot as only the gang at the bar could carry out. Although got, Diane is exhilarated: she s officially one of the gang.