Aborted

Few bands have such a strong following that its fans are collectively known by a certain name. Sure the Grateful Dead had its Dead Heads and Kiss has its Kiss Army, but its extremely rare to come across an underground band with an extremely dedicated base of zealot like fans. One exception is the Belgian death metal band Aborted, the group's fans follow the band on the road and dress in blood spatted surgical gear when they show up to concerts. This might sound a bit odd for people unfamiliar with the group, but for followers of the band it's a way of life.