Although the book explores the grim nature of war, it sometimes uses dark humor. For example, in this section, it’s ironic that Joe got hit with an artillery shell in a dugout that was specifically called “bombproof.” Furthermore, Joe’s ability to see the bright side of his situation—that at least he’ll never have to hear the awful sounds of war ever again—also demonstrates a dark sense of humor. The ringing telephone seems to connect to “ringing” ears, a common side effect of being caught in a big explosion like the artillery shell blast that injured Joe, which can lead to deafness like Joe’s.