Among the best-known and most robust biases in person perception is the correspondence bias--the tendency for people to make dispositional, rather than situational, attributions for an actor's behavior. The correspondence bias appears in virtually every social psychology textbook and in many introductory psychology textbooks, yet the authors' experience with teaching this bias is that students sometimes fail to recognize when they display it. Students also sometimes struggle with distinguishing it from the actor-observer effect, which in addition to the correspondence bias includes a tendency for actors to make situational attributions for their own behavior, and from the self-serving bias, which is the tendency for an actor to make internal attributions for personal successes and external attributions for personal failures. The authors describe a classroom-based demonstration of the correspondence bias. The demonstration is memorable, effective, takes roughly 5 minutes, and produced improvement in understanding of the bias. (Contains 2 tables.)