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I tried to do one better with a small flyback transformer.

Turns out there's not enough clearance in USB ports for tens of thousands of volts.

Nice! But I'm guessing you wouldn't be able to fit that into a size that's comparable with standard USB drive?

You could fit one into a portable hard drive case, though. Presumably along with an electric motor to make the appropriate noises when whoever you really don't like tries to plug it into their laptop.

Possible at a pinch, the flyback I was using right there was about the size of a walnut. You could lay most of it out flat with the voltage multiplier and encase the whole thing in epoxy for (ha) safety.

I really wanted to go much higher with the voltages, but the amount of noise this thing puts out de-focuses the camera.

Could you share the circuit diagram? I am intrigued.

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