Try it and see. Walk up behind someone in the street and zap em in the ass and see what happens LOL! just kidding. Well, look at the size of a cow, if a cow can feel it then I'd bet that a human would definately feel it. I would love a stun gun or tazer gun but I live in the UK where it is ilegal to defend yourself, you've just gotta stand there and let people rob your ass and burgal your house.