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.
Akira definitely counts. I’m sure my parents were in the “all cartoons are for kids” camp that everyone was in in the 90s. Similarly, the Guyver.