Let's Make Robots!

PWM through finger!

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Suspiciously I tried this but didn't get the same effect

You are obviously channeling supernatural energy from the spirit world.  The spirits have found that you are a good channel to the natural world and are trying to use you to communicate with the living.  When you touch the wire, their energy flows out into the servo.  If you hook up a speaker to your finger you will hear their voices.

Or maybe it's just electromagnetic energy from the power lines and radio transmitters and such being guided through your body like an antenna.