Now, my story is not as traumatizing as most here but it certanly did change my life.
I was starting my 7th grade at a new school, and everyone there was bigger than me (the school was for the grades 7-9) and there was a lot more people there too (300 instead of 200). So I got very nervous just by walking around as I'm afraid of big masses of people and it was even worse due to everyone being bigger than me. And of course, being socially inept (Asperger syndrome) and afraid I was picked on. I also followed a small group of people that I knew around, but one of them who I didn't know too well picked on me all the time for following them around and I stopped following them after some time. After that I pretty much lost my trust in my skills of interpating people, and I stopped trusting everything I thought I knew about other people.
In the 8th and 9th grade I got a bit more accepted, but I still didn't trust my social skills and I lost my last irl friend at that time too. It have gotten a bit better now, but I still can't talk properly with anyone else than my close family (when I do talk to anyone else I got to think a good 5-10 seconds extra to get a proper sentance thogether, and I also stutter a lot).
I hope it didn't get too whiny. Also, another thing that weren't that traumatizing, I saw "*insert porn title here* has finished downloading" when I was going to turn off a torrenting program that was leeching my connection. It was funny due to the ridicoulus title (the title was pretty much screaming "this is an ametour porno"), and I don't care much about what people do when they "are alone" anyway.