One time during recess in first grade I drew a picture of some surgical scene where there were two women strapped to operating tables and both of their arms had been amputated. Put it in a folder and my parents found it when I got home that day lol. It was pretty embarrassing.

It's always been sexual for me and I've had fantasies of people being dismembered since I was preschool aged (so like 3 or 4). Not that I actually knew what sex itself was until later though.