John Hetherington's Top Hat

Origin
John Hetherington is a presumed apocryphal English haberdasher, often credited as the inventor of the top hat, which is said to have caused a riot when he first wore it in public on 15 January 1797.

The common form of the story, as reproduced in many books, has it that he was arraigned before the Lord Mayor on 15 January 1797 on a charge of breach of the peace and inciting a riot, and was required to post a £500 bond. Reportedly he had "appeared on the public highway wearing upon his head what he called a silk hat (which was shiny lustre and calculated to frighten timid people)" and the officers of the Crown stated that "several women fainted at the unusual sight, while children screamed, dogs yelped and a younger son of Cordwainer Thomas was thrown down by the crowd which collected and had his right arm broken".

Effects
Although this hat was made well before the invention of the collapisble top hat, this hat is capable of being flattened and opened without issue. When worn, the hat induces sudden shock in any others who see it, ranging from inducing mild surprise to terrified shreaks to heart attacks.

Whether flattened or open, when thrown, the hat's brim becomes incredibly sharp and can slice through most substances with ease, including flesh and bone. The hat also possessed homing abilities, capable of going after a target selected by the wearer across long distances with little disturbance from turbulence. The hat is also capable of being recalled to the thrower's location at will, and can also do so once it slices through its intended target, thus making it a dangerous and effective weapon.

Trivia

 * This artifact was inspired by the character of Hatter Maddigan from Frank Beddor's The Looking-Glass Wars trilogy. In the novels, Hatter is a Milliner, a highly trained soldier with a weaponized hat. Among the hat's many capabilities, one of which is extending blades from its brim when thrown.