This paper describes the design, implementation and evaluation of a mobile application to support technology reflection through audience participation. To this end, three different approaches have been combined: (1) a cryptocurrency parody called "EatCoin" aiming at a direct experience of the useless resource consumption caused by Bitcoin's Proof-of-Work concept, (2) an ultrasonic communication channel circumventing the protection barriers normally provided by a smartphone's flight mode, and (3) a Turing test variant demonstrating the current state of AI-based music composition. The resulting prototype has been tested during a live demo in a scenario triggering intuitive user interest in using the app, and has additionally been reviewed by a group of experts from different domains. While it turns out that the application successfully prompted discussion and reflection among the participants, also some weaknesses could be identified during the trials that are considered in future work.

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