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In folklore and children's street culture, Bloody Mary is a game in which a ghost of the same name (or sometimes other names, such as "Mary Worth") 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. Some include chanting a hundred times, chanting at midnight, spinning around, rubbing one's eyes, running the water, or chanting her name thirteen times with a lit candle. In some versions of the legend, the summoner must say, "Bloody Mary, I killed your son!" or "I killed your baby." In these variants, Bloody Mary is often believed to be the spirit of a mother (often a widow) who murdered her children, or a young mother whose baby was stolen from her, which made her go mad in grief and she eventually committed suicide. In stories where Mary is supposed to have been wrongly accused of killing her children, the querent might say "I believe in Mary Worth." This is similar to another game involving the summoning of the Bell Witch in a mirror at midnight. The game is often a test of courage, as it is said that if Bloody Mary is summoned, she would proceed to kill the summoner in an extremely violent way, such as ripping his or her face off, scratching his or her eyes out, driving the person insane or bringing the person into the mirror with her. Other variations say that the querent must not look directly at her, but at her image in the mirror; she will then reveal the querent's future, particularly concerning marriage and children.

The boys ran into a spirit that used the Bloody Mary urban legend as a way to get itself back into the material world. It turned out to be the spirit of a murdered girl named Mary Worthington. Her killer cut out her eyes, and her spirit occupied a mirror in the house where she died. As she died, she tried to write her killer's name on the wall, but she never finished it, and the secret died with her. Wherever that mirror went, she went, and whenever someone summoned her in that place, she came out and killed the summoner if they had a dark secret about someone dying. If they didn't, she claimed the nearest person that did. They destroyed the spirit by destroying the mirror and then, when she came out (which they hadn't exactly forseen) forcing it to look into a mirror and remember all the people she'd killed.