Worst thing that I've done? Well, I can't seem to recall any....... I normally keep myself out of trouble and have the luck to not get myself into it, which I guess is good.
There was this one time though where I think I went a bit too over the top...
When I was really young I couldn't speak english. Yes, I know that most kids can't, but apparently the doctors said that I would never be able to speak full sentences or read or write, which lead to some difficult times when I was 3-5.
Anyways, when I was three there were these two five year olds making fun of me for not being able to talk, and since I couldn't speak to them, my frustration was just building up. So what happened when I couldn't take it? I snapped and began beating up one of 5 year olds, giving him a good run for his money. Obviously I don't think I needed to go that far, which sometimes makes me question what the rest of my childhood was like....
Fortunately I don't have anger management problems (I was tested) and I proved the doctors wrong with the whole speech impediment deal. But still, I feel a bit bad for how violent I was as a toddler...... Not sure if it counts or not, but hey, it's all I've got.