Bloody Mary Worthington

Bloody Mary Worthington is a witch said to appear in a mirror when her name is called three times.

"Bloody Mary" is a game in which a ghost is said to appear in a mirror when summoned. One of the more common ways participants attempt to make her appear is to stand before a mirror in the dark (most commonly in a bathroom) and repeat her name three times, though there are many variations. The game is often a test of courage,and bravery as it is said that if Bloody Mary is summoned, she would proceed to kill the summoner in an extremely violent way or bringing the person into the mirror with her. - edited from wikipedia