The word “crazy” means different things to different people. A cat lady is crazy. That homeless guy on the street is crazy. Your ex girlfriend is crazy (or at least she has a personality disorder).
However, there is a much more interesting, much more dangerous form of crazy – psychosis.
I throw around the words “psychotic” and “psychosis” a lot at work, and sometimes I forget most people don’t know what those terms mean (I didn’t before going through medical school). So here I’m going to break down the concept.