Hogwarts he is detected using magic in the presence of Muggles, a serious offence among the wizarding community. Dumbledore argued in Harry's defence, stating that it was done in self-defence, and that the Ministry has no authority to expel students – such powers are invested in the Headmaster and the Board of Governors. Snape has attempted to have Harry expelled, and he attempted to have Harry's father, James Potter, expelled when they were at Hogwarts together. The only student known to have been expelled is Hagrid, for the murder of Myrtle with an acromantula believed to be the Monster of Slytherin
The Demon Headmaster Headmaster by using mirrored sunglasses to trick him into hypnotising himself. The second story, called Carnival!, doesn't explicitly identify one of its characters as the Demon Headmaster, but from the illustrations and description are meant to make it obvious that it is him. The third story is called 'Maths Homework', and features a teacher referred to as Old Webster. This isn't the Demon Headmaster but is a very similar character. The introduction to the story says, 'Maybe you think you have spotted the Demon Headmaster somewhere. Are you sure? Things aren't always what they seem.' In the front of the