When disruptive or violent student behavior make their way into the K--12 classroom, the best efforts at classroom management can get derailed. The authors outline a three-part approach to addressing disruptive behavior to keep it from boiling into violence or crisis: clarifying norms and creating a safe climate; de-escalating the situation if disruptive behavior worsens; and creating a systemic crisis- and violence-prevention response schoolwide among key adults. They offer practical suggestions for how educators can implement each part of this approach.