A BOGGART is a creature well established in English folklore as either a household spirit or a malevolent genius loci (a geographically-defined spirit) inhabiting fields, marshes, or other topographical features. Other names of this group include bug, bugbear, bogey, bogun, bogeyman, or bogle, presumably all derived from (or related to) Old English pūcel (a domestic and nature sprite, demon, or fairy), related to the Irish "púca" and the "pwca" or "bwga "of Welsh mythology. It is said that when a hobgoblin is teased or misused, it will become a Boggart, whose sole reason for existence is to play tricks and cause trouble for people. They can be mischievous, frightening, and even dangerous, and they are very difficult to get rid of. Boggarts also tend to punish those who have offended, and in some cases, they are trying to punish a human for some perceived injustice. There is a household form that causes general mischief and makes things disappear, milk to sour, and dogs to go lame. The boggarts inhabiting marshes or holes in the ground are often accused of more serious evildoing, such as the abduction of children, and in some cases, it is thought that, much like vampires, they can be killed only by a stake driven through the body. The boggarts in the town of Lancashire, England, were believed to have a leader known as Owd Hob, a horned, hooved creature similar in shape to a satyr.