Demonstrations have long been part of postsecondary science teaching. Teachers understand that in today's constructivist classroom, students must be involved in their learning. This need for active student involvement extends to all aspects of instruction, including learning from demonstrations. Active demonstrations that engage students and require them to use science process skills can serve as meaningful learning experiences and provide students with a solid foundation for future investigations. In this article, the authors share some of their most successful student-involved demonstrations. (Contains 1 table.)