 Can the teacher fulfill her announcement? We have an embarrassment of riches. On the one hand, we have the student’s elimination argument. (For a formalization, see Holliday 2017.) On the other hand, common sense says that surprise tests are possible even when we have had advance warning that one will occur at some point. Either of the answers would be decisive were it not for the credentials of the rival answer. Thus we have a paradox. But a paradox of what kind? ‘Surprise test’ is being defined in terms of what can be known. Specifically, a test is a surprise if and only if the student cannot know beforehand which day the test will occur. Therefore the riddle of the surprise test qualifies as an epistemic paradox.