Can you really pass out if somebody uses a stun gun behind your neck?

Sean Brewer, A cop since '82, a 2nd Amendment advocate much longer.
Answered Dec 29, 2016
Contrary to what Hollywood wants you to believe, neither a stun gun, nor a Taser, has the ability to render you unconscious. A Taser operates on the principle of electrical muscular incapacitation, which is a fancy way of saying your muscles lock up. Part of the process for being able to carry a Taser on duty, is getting shot by it, so you know, first hand, what the effects are. It is intensely unpleasant. Once the Taser is turned off, or completes its cycle, there are, quite literally, no effects. You go from “HOLY MOTHER OF GOD!” to “Hey! I’m all better!” in the blink of an eye.
A stun gun, on the other hand, is designed for pain compliance. While they typically don’t hurt any more, or less, than a Taser, they lack the muscle lock up properties, and the effects can linger for a few seconds after the device is shut off.