Forty-nine introductory psychology students (28 female, 21 male) at the Mormon Church's Brigham Young University in Utah were tested to determine the effects of a pro-feminist, pro-Equal Rights Amendment demonstration by the Utah Women's Rights Movement on attitudes toward the women's movement, civil demonstrations, and Mormon Church leaders. Subjects completed a 30 item Likert-type questionnaire one week before the civil demonstration and again one week after. An analysis of covariance revealed a significant overall increase in negative attitudes toward the women's movement, with women showing a particularly significant negative shift. An overall negative change in attitudes towards civil demonstration in general was also noted although no significant sex differences were detected. Attitudes towards Mormon Church leaders remained unchanged. It is concluded that subjects experienced a boomerang effect in that their prior negative attitudes towards the women's movement and civil demonstrations were strengthened by persuasive attempts intended to have the opposite effect. Suggestions are offered so that boomerang effects can be avoided in the future. Test data are summarized in two tables. (Author/LP)