Bloody Mary

Bloody Mary is a Catoptromancy ritual which requires the performer to call out her name three times in the middle of the night, looking into a mirror. She is supposed to appear after the requirements have been passed.

Historically, the ritual encouraged young women to walk up a flight of stairs backwards holding a candle and a hand mirror, in a darkened house. As they gazed into the mirror, they were supposed to be able to catch a view of their future husband's face. There was, however, a chance that they would see a skull (or the face of the Grim Reaper) instead, indicating that they were destined to die before they would have the chance to marry.

The above content was based partly on a Wikipedia article, all credit goes to Wikipedia.