The myth is based on the real-life myth of the same name. The legend states that a tormented woman, named Mary, will appear if you chant Bloody Mary three times in a mirror. The woman appears to resemble the Ring Girl, who has also been reported to occur in the Johnson House. There are even urban legends of practitioners being killed by the ghost.
Many players claim that Bloody Mary supposedly inhabits the Strange Mirror. Such an event only occurs with the help of installed modifications. Players have modded the game, enabling Carl Johnson to chant Bloody Mary's name, and also makes her have a physical appearance. The myth lacks any genuine evidence. Mods are the only way to see her in-game, making this myth false.