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The teacher charged a 1 square foot sheet of mylar sheet up to approx DC 20 kv one day long ago in school via an modified EHT output of a TV.

I had one of my mates hold it by the corners in line with my hands, I then judged and guessed and clapped it with both hands opposite sides to discharge it.

I felt the compression thru my chest my heart seemed to sort its self out and that was 30 years ago.

Not too sure about brain damage?

I was never that good at basic school work anyway.

Calculation.

I am not sure about the contact closure time of hands (2 mS).

Full Hand to Hand resistance unsure (1 k).

Surface area of hand .054 m square.

Mylar sheet dielectric constant 3.1, thick enough to withstand 20 kv.

I have come up with 1.186 Joules or 600 W roughly discharged.