Yvonne Arias

Love is no laughing matter -- Mandy Moore guest stars -- J.D. (Zach Braff) becomes annoyed that new girlfriend, Julie (Mandy Moore), doesn't laugh, but rather tells him when things are funny. Afraid that he is going to screw up yet another relationship, Elliot (Sarah Chalke) encourages J.D. to start saying his feelings out loud and Turk (Donald Faison) tries to use his psychology background to fix the issue. Meanwhile, Carla (Judy Reyes) is upset when the Janitor (Neil Flynn) refers to the new nurse as a 'hot young Carla,' increasing her growing concern that she is too old to conceive. John C. McGinley and Ken Jenkins also star.

As Dr. Cox returns to work, J.D. reflects on the last five years -- After five years working at Sacred Heart, J.D. (Zach Braff) can't help but feel that the same things seem to happen over and over again at the hospital. Meanwhile, following his drunken breakdown in the wake of three accidental deaths, Dr. Cox (John C. McGinley) returns to work, but Elliot (Sarah Chalke) believes that Cox has lost his usual steely confidence when he hesitates to order immediate treatment for a patient. When her attempt to help him backfires, Elliott calls Dr. Cox on his behavior. Later, Carla (Judy Reyes) gets fed up with Turk (Donald Faison) flaunting everything he can do that she can't, now that she's pregnant. Neil Flynn and Ken Jenkins also star.