My dads brother visited us one time - when I was around 7 years old - and they sent me to bed and watched a movie together on TV. I’m not sure where my mom was, perhaps taking care of my little brother, but I quietly went down the stairs and saw them watching the movie, and I stayed very quietly so they would not know I’m there.
It was a Bruce Lee movie, “The Big Boss (1971)”. In that movie Bruce works at a ice factory and his boss kills some people and puts them into the ice. That’s not the worst of it. They then have those big ice blocks and a big blade saw and that saw cuts the big blocks into smaller peaces. It also cuts those bodies in the ice blocks into smaller pieces.
I couldn’t believe what I saw and went back upstairs and couldn’t fall asleep. I never told my parents.
I saw a nasty horror movie as a kid of around 7-8. My friend had this weird uncle who was living with his mother house next to ours. He was the only one at street with VHS player. One day, instead of our favorite Tom & Jerry, he put a cassette with the movie into the player. It was some weird horror called “the spirit of the Forest” or something like that, about a cabin in the forest and a spirit possessing its visitors, making them kill each other. I had trouble getting back home in the middle of the day. Fortunately, no nightmares. Few years later, the uncle killed his mother, because voices told him to. He got locked up in the psychiatric ward and my friend moved in with his parents, yay.