My parents were very restrictive.... I mostly grew up with the Disney Channel. And not much of that, my parents generally discouraging TV entirely, encouraging play and books. We do the same with our son.
I have 2 older (surviving) siblings. I was 12 or 13 when our parents were away and the 3 of us were watching TV when "The Green Mile" came on. I think it was my brother who had heard this was a great movie and wanted to watch it, my sister and I had never heard of it. Anyway, I don't think I was engaged or particularly watching it BUT there came that scene with the execution. My sister ran over to me and covered my eyes while my bother turned off the TV as fast as he could, both (somehow) knowing how much this would disturb me (even at that age). And they were right. To this day, I have that image burned into my brain.... and for days after that, it troubled me greatly. For some reason, violence bothered me a lot.... frankly still does.
.