Movie rule #4,627: Even the slightest head impact will knock someone unconscious.
Most common in: Action Movies
The typical scenario: The hero whacks somebody on the back of the head with his fist or a gun and the enemy crumples instantly like a sack of potatoes. And once knocked unconscious, they will stay unconscious for as long as they are required to be. Of course, in real-life, hitting someone on the head will usually just make them mad. People do get knocked unconscious, but that's somewhat rare and usually only last for a few minutes. And a head impact that knocks someone unconscious is just as likely to kill them. Imagine a movie where James Bond sneaks up to a guard, thumps him on the head, and the guard turns around and shoots him. I'd like to see that.