The recent cognitive theory of obsessions suggests that catastrophic misinterpretations of the significance of one's unwanted intrusive thoughts gives rise to, and maintains, obsessions (Rachman, Behaviour Research and Therapy, 1997). It follows from this that provision of benign interpretations of the significance of intrusions is likely to challenge and weaken the catastrophic appraisals. This article describes the application of this theory to two adolescents with obsessive-compulsive disorder (OCD). The adolescents were provided with an alternative, benign interpretation of the significance of intrusive thoughts and images using a thought suppression paradigm. It is concluded that a personal demonstration using the thought suppression paradigm is a helpful clinical tool for the cognitive treatment of obsessions in adolescent OCD.