 Nervous because they think he still has feelings for her, Diane and Frasier tell Sam that they are moving in together. Sam is happy for them, as happy as he can be for Diane and Frasier. But in a private discussion between Sam and Diane, each has an underlying but unspoken air of apprehension about this move. After Diane moves in with Frasier, she develops a constant tickle in her throat and sneezing fits which she attributes to being allergic to Frasier s dog, Pavlov. Sam thinks her symptoms are psychosomatic, masking a reality of not wanting to live with Frasier. When Sam agrees to take Pavlov after Frasier offers to give her up for Diane, Diane seems somewhat annoyed. After Pavlov leaves the Crane-Chambers household, Diane develops another symptom in addition to the tickle and the sneezing, that of a "voice change" which words alone cannot describe adequately. This added symptom is also despite the house being fumigated, the upholstery changed, and the wallpaper stripped. Finally Frasier is fed up, and faces the reality that Diane s symptoms are indeed psychosomatic; she still doesn t agree but can t get over the fact of the symptoms. While Diane s off in the bathroom dealing with her symptoms, Frasier asks Sam for his dog back. Sam refuses and they get into an argument, during which Frasier adamantly declares his love and commitment for her. Diane returns just in time to hear this statement, thinking that they are arguing about her. All of a sudden, her symptoms subside completely. Elsewhere in the bar, it s Carla s birthday, and the course for such is a series of gag gifts, even from Frasier and Diane. Although not unexpected, Carla is hurt. Sensing this, the guys decide that it might be a nice gesture to get her a "sincere" gift, which Cliff offers to go out and buy. When he returns and gives the gift to Carla, she loves it and expresses her gratitude to everyone. But how sincere can the gift be seeing that it was purchased by Cliff?