Get a buddy to work with. Think of a well-known person, past or present, who's known for outrageous or unusual behavior. Try to explain this person's behavior from the viewpoint of each major psychological approach (or perspective). The reasoning can be as crazy as the behavior itself, as long as its in line with the approach (or perspective).

Approaches (or perspectives)

Humanistic

Cognitive

Neurobiological

Evolutionary

Psychoanalytic/Psychodynamic

Behavioral

Sociocultural