This video shows how not to shoot a 50 BMG Rifle. We have no idea what 50 BMG means but its a damn big gun.
Luckily, this is a gun fail that results in no one getting hurt.
Instead, the older gentleman is having a picnic lunch with a friend when he decides to fire off a couple rounds. The intensity of the blast disperses from the muzzle, blowing his lunch away. Even a cooler some five feet away gets blown over.
If anything, it's a good lesson on gun safety.