The law of guns in movies

[Trouble Magnet]

The best way to fire a pistol is to hold it sideways,or upside down,than spray and pray.
Handguns always make the cocking sound whenever they are drawn or pointed at someone.This is most amusing when it's done with a Glock or other hammerless weapons.
After firing about 400 rounds from an SMG or an assault rifle(from a single magazine of course), the next time they are aimed at the main villain/hero it will make a loud click sound,preferably multiple times(this does not count for DA/DAO handguns )