Don't listen to that elbow or back of the hand crap. Even though most if not all electric fences are DC, they pulse the current so you would never have a clench response. Instead, pick up a blade of grass and touch it with that. The grass acts as a resistor and lowers the current you receive. He did earn a few Darwin points however for standing in a mud-puddle and touching something electric. He should go hug an electrical engineer for sparing his life.

What a pile of horse-shit. You empower people by educating them. Not by selling them on some Kickstarter video... I don't buy it.