An audio-visual tool for teaching in the affective domain was produced and utilized with clinical laboratory science students at Mercy College of Detroit. Videotape trigger films were employed to portray real-life laboratory situations. Each dramatization concludes without reaching a resolution. The purpose of the films was to trigger discussion concerning the resolution of the situation presented. The trigger films were received enthusiastically by the students. This instructional method provides an efficient means of stimulating discussion concerning the situations presented, as well as other related topics. The advantages of this approach to teaching in the affective domain are discussed. The paper also describes preparation of the scripts, directions and filming of the trigger film dramatization. Classroom utilization of trigger films and their adaptability to various student levels is described.