We've heard the tragic stories: A 22 year old opens fire at an Oregon Mall, A U.S. soldier killing his comrades, a Colorado theatre massacre.

So, what makes people "snap" and turn to this kind of violence? One thing is for sure. The violence may seem sudden, but there's been a buildup before the murderous act!

Delusional disorders are on the rise, but there's always warning signs that someone is about to turn to violence!