The first one the shooters trigger finger was on the side of the gun. The trigger either caught on something in his holster, or the video is fake.
The one at 0:32 where the sign falls down and "shoots" the guy in the ankles is with a pump shot gun. He does not pump it after his previous shot. There was no round in the chamber. There also was no recoil to the gun. Fake.
The one at :51 where the guy looks down the barrel and shoots his hat off shows that the gun recoiled "down" when shot. And if paused, you can see the phantom image they used to simulate recoil. Then they simply fired a shot through the bill of the hat to "prove" it. Fake.
The one where the girl got knocked over by recoil could easily be real. Plenty of footage to back up something like that.
But, most of this, I am not buying....... :-\
People just LOVE to trick other people. I don't mind it when it's someone swapping the sugar with the salt, but videos like this one are harmful and cause confusion.