For me, I think it was when I was playing in the yard, and saw one of my mom’s pots of dirt for her garden, and I thought “yeah this would be good to dump on my lap”
It was full of fire ants. Big, angry, north carolinian fire ants.
I was covered in red welts and all I remember is screaming at the top of my lungs while my mom sprayed me down with a hose
Absolutely lame, but age 12 I remember the worst most intense pain I ever felt was sitting on my own thumb after pulling a wooden stool towards me - crushed it right on the edge corner and it was so intense.
Way more painful than the time I got a drawing pin (thumbtack) half embedded in my heel, impaled my wrist on a set square, or winded myself falling chest-first off a skateboard.
I’ve been pretty lucky/sensible