I traumatized a childhood bully purely by greeting them.
So I was always very easy to bully due to my atrocious self-confidence, and my higher than average height. I was 1.76m tall ( 5'08" ), which is tall for an 11-year-old boy. But because I was always drooped and acting like a meek lamb, I was picked on rather easily. So this much shorter boy, which I'll refer to as 'D', started making my life utter hell. Messing with my property, chasing me down the street by threatening me with voilence, and constant verbal abuse. That boy was the bane of my existance for the 2 years I've spent on that school.
I only learned to stand up for myself half-way through the second year of highschool. But since then I've never had an issue with my confidence again. Straightening my back, and proudly walk around as my own person. I feel like that could've been sooner if that boy didn't choose me as a target.
Many years later, perhaps in my mid-20's, I'm in my mid-30's now, I stopped growning. I had reached the nice height of 2.08m (6'10"). And was out to get some groceries. When I saw a certain recognisable face in the distance. It was 'D'.
Now by that time, I had already forgiven him, I mean, why would I hold a grudge for the actions of a preteen bully, right? I approached him and just said hello. Asked how he was doing.
That guy utterly shat himself, he went white as a sheet and looked at me as if I were about to put him in the ground without warning. He trembled a little bit too. Of course I noticed. But I just kept being friendly, until he 'had to leave' and walked off perhaps a bit faster than he had to.
So in his head, I was a lot more dangerous than I actually was. But I liked that he traumatized himself to such a level of fear. Purely by the fact that I didn't stop growing, and didn't lack confidence anymore. He was preparing for consequences which never came, and were never coming either. In hindsight, I felt pretty good anyway.