After an unusually long stretch in the OR, Hawkeye and Trapper argue, and decide that they need some R&R. Unfortunately, Henry is leaving for a few days, leaving Frank — who is unlikely to let them have R&R for any reason — in charge.
Hawkeye decides to pretend to be insane to try to get a few days off despite Frank's prejudice. He rejects a proposition from an attractive nurse, eats a plate of ostensibly human liver in full surgical garb, and reacts violently when Frank touches the plate. Trapper tells Frank that Hawkeye is losing it, and that he (Trapper) should take him to Tokyo for R&R.
Uncertain about whether they are serious or if it is an elaborate act, Margaret calls in a psychiatrist friend, Capt. Philip Sherman, to assess Hawkeye's emotional state. After Hawkeye tells Sherman that he is in love with Frank, Sherman declares him to be insane. When Henry returns and learns of Sherman's finding, he argues that Hawkeye was merely trying to get R&R, but Sherman insists that Hawkeye needs to be committed to a hospital in Tokyo.
Hawkeye, upon hearing this, confesses he simply wanted a holiday from the war, but Sherman, who has designs on Margaret, insists that he be sent for treatment. Hawkeye concocts with Radar an elaborate plan to foil Sherman, Margaret and Frank's plan to get Hawkeye out of the unit. Radar talks to Sherman plants ideas in his mind that Margaret, who has rebuffed all of Sherman's past advances, has the hots for him. Meanwhile, Trapper switches signs on Margaret's tent, leading Sherman to believe it is the VIP tent. After Sherman returns and settles in Margaret's cot, Trapper switches the signs back. When Margaret comes back and starts undressing, Sherman excitedly launches himself at her and drags her onto the cot. Margaret screams out and various members of the camp rush in, making it appear that Sherman was attempting to rape Margaret. Sherman flees the unit that night and Hawkeye is allowed to stay.