Seriously, what did they expect? The first thing you learn before getting a gun is to never assume a gun is unloaded or safe, even if you just checked it. Never point a gun at anything you do not want to shoot. As always, safety rules are writen in the blood.

This could have been a case of someone giving them a gun without going over the basics of how to safely handle them, or of him intentionaly ignoring safety rules for the video.