In 2016,Microsoft launched Tay, an experimental artificial intelligence chat bot. Learning from interactions with Twitter users, Tay was shut down after one day because of its obscene and inflammatory tweets. This article uses the case of Tay to re-examine theories of agency. How did users view the personality and actions of an artificial intelligence chat bot when interacting with Tay on Twitter? Using phenomenological research methods and pragmatic approaches to agency, we look at what people said about Tay to study how they imagine and interact with emerging technologies and to show the limitations of our current theories of agency for describing communication in these settings.