Someone in my family has been using clonazepam for ten years, and over the course of this time he has gone from being a fun, nice, goofy guy to an angry, controlling, obnoxious guy, who gets into arguments with people everywhere he goes and constantly sends people rude e-mails. I was discussing his craziness with another family member and we started asking "When did he start being this way?" and realized it started a while after he got on the klonopin, and has gotten worse and worse, and we started wondering if klonpin might have been the cause. Does anyone else have any experience with this?