When we have an electric gun, we often faint, why?

Electric guns are quite common weapons used to defend themselves. Although it does not cause damage, it can help you defend in case of danger.

1. The hair of the nape of the hair watching the experiment proved the tremendous destruction of electric current 20,000V
2. Why are there three plugs and three legs in the power plug?
3. "Gods", Tesla's super weapons can wipe out the army from hundreds of kilometers

In the movies we see people with electric gun attacks fainting. So, how do electric guns affect the human body and brain, causing the victim to be paralyzed and unable to move?

Check out the video below for answers!