The law of guns in movies

[Excalibur]

SMGs and ARs are sprayed by people who are about to get killed, but when wield by the main hero, it is deadly accurate.

People always put their finger on the trigger, hold the magazine when shooting,

Drop a shotgun on the floor and it goes off.

If a gun gets shot off the hand of an actor, NOTHING happens to his hand or the gun itself.

Shooting akimbo makes the main actor awesome and accurate. And if the director is John Woo, he'll have unlimited ammo.

Spinning the chamber of a revolver, despite having no cylinder lock to ratchet against, it makes the ratcheting sound.

Oh, all guns when pointed at someone's head from behind makes a clicking or locking sound before the camera moves to reveal that a gun is being held to the head despite that a Glock much less any gun wouldnt make such a loud sound

Actors always pull the hammer back down to show "they mean business" despite the fact that if the gun is single action like a 1911, wont fire if the hammer is up.