Good teaching often relies on productive classroom discussion. However, many of us have experienced dynamics in which our discussions take a perilous turn and a palpable tension settles over the class. The precipitating comment may have offered a provocative perspective on an issue—maybe it rather aggressively challenged something someone said, or perhaps it smacked of racism, sexism, or some other discriminatory innuendo. Generally, students respond to comments they perceive as contentious with an awkward, uncomfortable silence. Nobody says anything; body language registers a collective recoil. What can or should teachers do when situations like this occur? Constructive disagreement, argument, and debate can play instrumental roles in learning, but not unless the exchange moves forward constructively. I’d like to offer three suggestions that can help teachers safely navigate through the potentially destructive terrains of contentious comments.