I went to the Anime That Scarred You For Life panel. That was a hoot! Volunteers from the audience got up and told their stories into the mic. It wasn't very productive in the sense of finding new things to watch (most of what was mentioned was stuff that I've seen, stuff that I already know I don't want to see, or stuff which the story made it obvious that I don't want to see), but it wasn't meant to be. It was meant to be funny, which it certainly was! (I did get one new title: Miyuki-chan In Wonderland.)
I don't really have any scars from anime. By the time I really got into anime about ten years ago, the scarring had already been taken care of by another fandom. A lot of things didn't bother me, and on the points that did, I had already learned about reading both the front and the back, literally or figuratively, and I had learned principles of self-defense such as "When in doubt, put it back. There's more good stuff than you can ever afford or read/watch. You don't really need to go mining the marginal areas." My worst anime memory is of the movie Harmageddon, which was not horrifying, just boring and incoherent.
I do have a couple real manga scars, but I'm not going to talk about those. In both cases, they were things I downloaded and couldn't do a proper sniff test on beforehand. I don't do that anymore.