Aggression is behavior that is intended to harm another individual. Aggression may occur in the heat of the moment, for instance, when a jealous lover strikes out in rage or the sports fans at a university light fires and destroy cars after an important basketball game. Or it may occur in a more cognitive, deliberate, and planned way, such as the aggression of a bully who steals another child’s toys, a terrorist who kills civilians to gain political exposure, or a hired assassin who kills for money.
Not all aggression is physical. Aggression also occurs in nonphysical ways, as when children exclude others from activities, call them names, or spread rumors about them. Paquette and Underwood (1999) 1found that both boys and girls rated nonphysical aggression such as name- calling as making them feel more “sad and bad” than did physical aggression.