Chapter 5 opens on a Saturday evening at Pencey Prep with a snowball fight breaking out on the grounds. Holden and his friend Mal Brossard decide to take the bus into Agerstown to see a movie, and Holden reluctantly invites his annoying neighbor Ackley to join them. The gesture reveals an important quality in Holden: despite his constant complaints about Ackley's poor hygiene and irritating habits, he feels sorry for him because nobody else has invited Ackley to do anything that weekend. This small act of compassion hints at the deep empathy that lies beneath Holden's cynical exterior.
The movie turns out to be one they have all already seen, so the evening amounts to little more than eating hamburgers and heading back to the dormitory. Upon their return, Holden finds himself alone in the room with time on his hands and an English composition to write for Stradlater, who is still out on his date with Jane Gallagher. Stradlater has asked Holden to write a descriptive essay about a room, a house, or some personal object, and Holden decides to write about his deceased younger brother Allie's baseball mitt.
The description of the mitt becomes one of the most emotionally significant passages in the novel. Allie, a left-handed fielder, had covered his mitt with poems written in green ink so that he would have something to read when he was standing out in the field and nobody was up at bat. Holden explains that Allie was extraordinarily intelligent and the nicest member of the Caulfield family. He recalls that teachers who met Allie would later tell their parents what a pleasure it was to have him in class. Holden keeps the mitt in his suitcase and clearly treasures it as one of his most important possessions.
As Holden writes about the mitt, his grief rises to the surface. He reveals that Allie died of leukemia on July 18, 1946, when Holden was thirteen. The night Allie died, Holden slept in the garage and punched out all the windows with his bare fist, breaking his hand so badly that he was unable to make a proper fist afterward. He acknowledges that it was a stupid and irrational thing to do but admits he hardly knew what he was doing at the time. His parents even considered having him psychoanalyzed after the incident.
This chapter marks a turning point in the reader's understanding of Holden Caulfield. His grief over Allie's death is revealed as one of the central emotional forces driving his behavior, his distrust of the adult world, and his desperate desire to protect innocence. The baseball mitt, covered in poems in green ink, becomes a powerful symbol of Allie's unique spirit and of everything Holden has lost. By choosing to write about this deeply personal subject rather than a generic room or house, Holden shows that beneath his disaffected facade, he is a young man haunted by unresolved pain and longing for a connection that death has permanently severed.