Blair Witch

The Blair Witch was a supernatural American hoax that was proven to be orchestrated by adolescents.

Sebastian Chiltern mentioned it to the Eighth Doctor in 1883. (PROSE: Camera Obscura)

Mickey Smith described the graphics of Death to Mantodeans as "all Blair Witchy, like you really feel you're there". (PROSE: Winner Takes All)

Behind the scenes
The Blair Witch is a fictional ghost from the horror franchise. According to I, Who 3, the mention of the Blair Witch in Camera Obscura is a mistake and Lloyd Rose had intended to instead make reference to the real life legend.