I knew someone in elementary school who brought us other kids to his backyard. His older brother was a few years older, and showed us a nest of ducklings. Before any of us knew what was going on he:

1. Picks up a shovel and swings on the nest several times
2. Pulls out a small tin of lighter fluid and and a lighter, douses them and lights it.

I was so fucking stunned. It is still seared in my memory. I don't even remember being scared, just immediately outside my body.

Eventually we ran home. I remember feeling nauseous for days. I never told my parents, out of fear, and I regret that.

I later learned that kid was sent to a disciplinary school after threatening his dad with a knife, and soon after the family and my peer moved away.

Wanna guess what the evil brother does for work now?