I was bullied, yet always fought back.
In primary school my "friend" thought it would be funny to stick a spider down my back (he knew I was arachnophobic). I took off my jumper in a panic then jumped on him, wrapped it around his neck, and proceded to strangle him. Teacher saw and broke it up.
In high school my fighting back would sometimes rally support in my favour. I had a major bully who would torment me and get violent towards me. Quite bad too. I'd always attempt to fight back but fail as he was much larger. Eventually though I kicked up such a fuss that the class took notice. He was alienated by the whole school and had to change schools in the end
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Another time I was in the changing rooms when the next class had started and a bunch of guys from two years up came in and started to pick on me. I don't know who got violent first but one of the higher years saw me in trouble and slammed the other guy against the wall, allowing me to go in peace.
In one class the kid behind me started making up nasty shit about me when I was clearly within earshot. When we left class I mad sure I was out first, hid round the corner, and as soon as he came along I ambushed and preceded to lay into him. Got him in a headlock and smashed his head against the wall a few times. It was broken up and next I heard he was crying about it in the toilets.
One kid threw batteries at my back (they really fucking hurt). I got up and threw my chair at him.
I once held a power drill to one kid's head. Probably was never actually going to hurt him, but the scare was enough to get him to leave me alone.
I've thrown hammers and hockey sticks.
And one time I threw this little shit across the desk for annoying me in chemistry. The teacher threw him out of class saying that I was clearly provoked.
I bet you guys thought I was such a laid back guy too.