How to KO someone by pinching there neck?

Question

I always see it on TV when someone pinches another guys neck and they pass out. How do you do this exactly and any pointers on other ways for a quick KO or painful attack.

(Don't say nuts kick!). I was hoping for something when I can simply poke or pinch for this.

(FYI: Asking because I want to be ready in a probable attack, fight, etc.)

Answer 1

You can't pinch someone an knock them out. But you can choke someone out by cutting off their circulation in a head lock. It's done a lot in martial arts ie. Judo. It's not a good feeling.  

Answer 2

That only works if you're a Vulcan.

Answer 3

Hit them in the right spot in front of the throat and they go down automatically. TV is just that, TV. Anything to make good tv they'll do.

Answer 4

Umm...I think you watched too many Star Trek episodes.  Dr. Spock was a character.  He didn't really KO anyone by pinching their neck.