© The Author(s) 2019. Deception detection is a topic covered in many psychology and communication courses. We designed and implemented an engaging class activity to facilitate the students’ learning of several key concepts related to sender and receiver variability in lie detection. The pedagogical effectiveness of the activity was measured. In line with previous research, the students had difficulty acknowledging and correcting their own biases. However, the teaching activity was successful in correcting their general beliefs and facilitating learning.