Communicating science to the public is increasingly important. Demonstrators are a valuable and established tool for communication in technology research and development. However, their role in communicating current science and technology to the public has not received much attention neither in research nor practice. This paper reflects on the design and usage of the demonstrator 'Rock, Paper, Scissors', which we developed to communicate current advances in Human-Robot Interaction to public audiences. We discuss two years of 'Rock, Paper, Scissors' in action and its evolution within this period. We conclude with an outlook to future work regarding technology development and evaluation of science communication.