I did something mean to someone's friend who was wearing a cast--I yanked his arm--while they were teasing me on the bus. This guy snipped my hair, elbowed me in the face two years later, and tried twice to trick me into being pushed over, succeeding the second time and giving his assistant a high-five. He's now a professional football player.
A few years later still, one of his friends yanked my hair and my tie, essentially because I was wearing a suit. (Why else?)
At the end of high school I met a pretty mean bully who played on the EverQuest PvP server. He had a way to hurt people with words.
Just a few years ago I was hit on purpose by a car while walking to the store, mugged on university campus, and bullied at work by someone who deducted from my paycheck (there's actually a curious coincidence that involved him in which I heard a rap song after being discharged one day).
So people have bruised me pretty badly, gotten away with it, and left me alone to wake up every morning to a Hell of nausea, sickness, and hallucinations. In my darkest hours, I've felt like I was directly attacked by Satan.