Abnormal behavior itself is rare, that's what makes it abnormal. Mental retardation is an example of statistical infrequency, falling below intelligence on a bell curve line; different from the norm. Violating social norms is similar, an action that threatens or makes those who observe anxious. These two parts are the building blocks of abnormal psychology. You can have both of these aspects and still be considered normal behavior; a transvestite walking down the street in Regina is rare (statistical infrequency) and a violation of social norms (small town Saskatchewan), but does not cause any harm to themselves or those around them. There is no reason to intervene in this person's life, he is not unhappy (unless he internalizes a homosexual need), he leads a conventional life and is often