Funny when I was in junior high school my friend and I built a tesla coil. We spent hours in contact with it causing our hair to stand straight up, holding fluorscent bulbs near the thing and watching them light up. I don’t remember a single burn from that experience.
Perhpas this tesla coil was a bit stronger than yours.
You don't go branding your students who disagree with you. That seems pretty basic.
How would you feel if a teacher branded your kid with the name of Darwin?