IED is a DSM diagnosis used to describe people with pathological impulsive aggression. Many clinicians and researchers rarely consider this diagnosis, although impulsive aggressive behavior is relatively common. In community surveys, 12%–25% of men and women in the United States reported engaging in physical fights as adults, a frequent manifestation of impulsive aggression (Robins and Regier 1991). Impulsive aggressive behavior usually is pathological and causes substantial psychosocial distress or dysfunction (McElroy et al. 1998). Being on the receiving end of impulsive aggressive behavior can lead to similar behavior in a child who grows up in this environment (Huesmann et al. 1984).