Man, I got into tons of fights and scraps when I was a little kid. I'm talking like 7 or 8 years old. I was a chubby little guy back then, and my last name is easy to make fun of, so I was always getting picked on and bullied constantly, and I always stood up for myself. So much so, that after a few dozen trips to the principal's office for stomping some ass, they threatened to expel me and send me to some militaristic disciplinary school with whacked-out little kids. I became fairly passive after that, and learned to ignore people.
The one thing, to this day, that makes me go all Hulk-like is witnessing guys raising their hands to girls. Back in high school, me and a few buddies went to the movies. When we were leaving the theater, I heard some yelling coming from across the parking lot, and when I looked over I saw this dude slap the shit out of this girl. She was crying and yelling for help, and everyone was just walking by pretending like they didn't just see this. I told my friends I'd be right back, walked over to the dude, and told him to just walk away and cool down. He gets all in my face, telling me to mind my own business, this was between him and his girlfriend, yadda yadda yadda. I told him if he hadn't hit his girlfriend, I would never have gotten involved, that I didn't want trouble, to just walk away and cool down a bit. Then the girlfriend said something to the effect of "Just listen to him, go cool off and we'll talk about this." That's when he raised his hand to hit her again, but he was eating my fist before he could even finish thinking about it. He was out cold lol. Everybody rushed me though like I had just committed murder though. He hits this girl, everyone turns away. I knock him out, and they maul me like I'm the bad guy.
Long story longer, the cops show up and cuff me, sit me on the curb to cool down even though I was cool as a cucumber at this point. Another cop shows up a few minutes later, and I overhear some other cops explaining to him what happened. Turns out the dude I knocked out was this cop's son, so now I'm thinking that I'm totally screwed. He comes over, helps me up off the curb and takes the cuffs off, and thanks me for teaching his kid a lesson.