Making students revisit their worldviews through an encounter with discomforting ideas is a valuable teaching and learning device. We administered an exercise in our "Democracies, Diplomatic Relations, and Global Business" upper division course that documents the reactions of our students to different worldviews. We found that students were more accepting of the provocative propositions in the post-instruction exercise given at the end of the course than in the pre-instruction exercise administered at the beginning of the course. We conclude that exposure to different worldviews, a fundamental activity of international studies courses, expands students' perceptual horizons and their cognitive and affective awareness.