http://en.wikipedia.org/wiki/Scold's_bridle
Quote:A scold's bridle, sometimes called "the branks", as well as "brank's bridle" was a punishment device used primarily on women, as a form of torture and public humiliation.[1] It was an iron muzzle in an iron framework that enclosed the head. The bridle-bit (or curb-plate) was about 2 inches long and 1 inch broad, projected into the mouth and pressed down on top of the tongue[2]. The "curb-plate" was frequently studded with spikes, so that if the tongue moved, it inflicted pain and made speaking impossible.[3] Wives that were seen as witches, shrews and scolds, were forced to wear a brank's bridle, which had been locked on the head of the woman and sometimes had a ring and chain attached to it so her husband could parade her around town and the town's people could scold her and treat her with contempt; at times smearing excrement on her and beating her, sometimes to death.