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
When I was 13 I wrapped a fire cracker in tape apart from the end with the fuse (I thought it would be louder that way). It exploded in my hand as I lit it.
My hand was fine because of the tape but the full force of the blast came out the untaped end and shot fragments of paper and black powder right into my face and eyes.
Ended up having to get rushed to the hospital for emergency surgery. They basically removed several layers of skin from my face and scraped the debris from my eyeballs. After surgery I couldn’t see further than like 10cm from my face and the doctors told me either it would be permanent or I’d be able to see again in a week or so. Luckily it was the latter.
I got extremely lucky and made a full recovery.