I was violently bullied at school, and on top of that I witnessed domestic violence for most of my life - so although I (albeit rarely) sometimes spit my dummy, I feel that my self control (especially physical), is respectable given what I was brought up around.
That said - in my last year at school, I did reach a pont where enough was enough, and I lashed out at a bully.
An older (and much larger) guy at school had been tormenting and pushing me around for about 3 years. After putting up with it for this long, one day when he started pushing me, I flipped, and bent his nose (despite numerous requests from the head to help get him to leave me alone first).
Guess who ended up in trouble?
(I don't think I helped my case at the time. "Yes sir, I did hit him in the nose, and if he continues to bully me I will do it again - only harder

)