Samantha: yes, I used to think my ex was bored because when things were peaceful, he couldn't stand it, and needed to make some "noise"...needed to upset people. And Bunny, I do believe his threshold for excitement is high, and his self awareness is low and completely avoided. All of the teasing and prodding would reach a point where he really upset others, and then he would sit back and actually start smiling or laughing. I saw him do this recently with our 17 year old son regarding college. Luckily, a few days later, my son commented that "that was all dad" acknowledging that his dad had dumped his negative energy all over my son.
So, although my ex is not overtly "violent", he seeks stimulation that others would find over the top....affairs, drugs, alcohol, conflict.