my boyfriend "raged" when he was on cocaine... it would come out of nowhere and stop as fast as it came on. the first time it happened, we were in the car on our way for an out of town weekend and i was so scared. and when it was over...he got quiet..then just acted like it never happened. I was probably as confused as i was afraid... that was when i KNEW something was not right. (I didn't know he was doing cocaine, just thought he drank too much beer..surprise, surprise)