Harkening to the pre-cell phone era, this urban legend would require that the home in question have two separate telephone numbers.[Or maybe not: evidently there are tricks to dialing your own number from a rotary phone.] But urban legends deal with fears, and in this case the fears being played upon involve stepping from adolescence into adult responsibility, failing as a future homemaker, and being dominated by a frightening, aggressive male figure.
Bonus entry: The incident on page 179 involving the lighter and a can of hairspray was literally a dream that I had one night shortly before writing this scene. When I woke up, I thought the dream was hilarious, turning a similar scene in Watchmen on its head. So I decided to use it in The Billionth Monkey. Sometimes my unconscious writes the best material.
FOR FURTHER READING
Jan Harold Brunvand. “The Baby-sitter and the Man Upstairs.” In Encyclopedia of Urban Legends (New York: W. W. Norton & Co., 2001), 28–9.
Anonymous. “The Babysitter and the Man Upstairs.” May 20, 2014. Snopes.com