The electrochemical polymerization of aniline and pyrrole, and demonstrations of electrochromism and the polymer battery effect, are presented as demonstrations suitable for high school and introductory chemistry at the university level. These demonstrations promote student interest in the electrochemical preparation of conducting polymers, where the doping and dedoping processes can be readily understood from the vivid electrochromism displayed by these two polymers. (Contains 5 figures and 1 scheme.)