From arfcom:
So I went out today with a vendor to shoot my rifle for the last time (sadly had to part it out).
All things going great and we hear a EXTREMELY LOUD BOOM. Screaming ensues. "CEASE FIRE!!! CEASE FIRE!!! CALL 911!!! CALL 911!!" and all the RO's are running to this one guy..
Well come to find out this was the FIRST SHOT FIRED from a Brand new Vulcan 50cal using factory ammo. The bolt lugs disintigrated, the charging handle sheared from the bolt, and the bolt exploded backwards and lodged into the guys neck area. They found the charging handle about 30 feet behind him in the grass while the paramedics were tending to him. Ambulance arrived quickly, and im no doctor, but it looked like the guy was going to be alright based on the fact they didn't seem to be too worried while tending to him.
Look at the RIGHT HAND PURPLE GLOVE
http://www.liveleak.com/view?i=963_1392257627