My mother-in-law warned me that boys are different from girls. “I never bought my boys guns,” she said, “but they’d chew their toast into the shape of a pistol.” Of course, I assumed that I would never have her problems. My boys would be perfect angels far more interested in Botticelli and Brahms than in bazookas. “Come read to us from the works of Emerson, Mother!” they would beg. “Can we please listen a little longer to the sonata?” Right. Not so much. Every day I listen to the sounds of starship battles and the clanging of imaginary swords. I hear the shrieks of the dying and the battle cries of enraged warriors on the great bloody battlefield of my living room sofa. What happened?