MJ...
I did this too, many years ago, when the gadgets were fairly new. The friend in question had a girlfriend who worked downtown, 2nd shift. He wanted to see if the stun gun he'd bought her was really effective. I volunteered to help, 'cause I wanted to know the same thing myself. Long story short, when zapped anywhere but dead center of thorax, I was able to easily grab the thing away and turn it on him! Zaps to the extremities weren't bad at all, didn't slow me down in my "counterattack". Hope the gizmos have improved since then. Think I'll just read other people's posts on the subject nowadays, though....