
empty keg value
So if you buy a keg, the price also includes a deposit on the keg itself, which you get back when you return the empty one.
Kegs are sometimes the source of beer at underage parties held in remote outdoor locations. According to and old college roommate, the sheriffs near his hometown had a unique way to deal with breaking up underage parties: shoot the keg. Literally, they'd use their sidearm to blast a hole in the keg.
I suppose they couldn't just leave it there, and siezing it was more trouble than it's worth. Shooting it means nobody can sneak back to drink, plus the lawbreakers lose their deposit.