When using a firearm, there are about a million rules and safety precautions that one must follow, perhaps none more important than "Don't look down the barrel of the gun."

This dope, who no doubt just finished sniffing the glue that he used to put the PVC pipes together to form his sweet potato gun, was finally going to test out his homemade contraption. But at the moment of truth, the gun jammed. So what did our hero do?  He took a glance down the barrel.  

The result? He paid the price in the form of molars and bicuspids.