According to the premise of the book, the rain in Sunnydale is magical on Halloween, and if it lands on a scarecrow it will animate and hunt down the Slayer.
Halloween | Singin' in the Rain | Rain Man | Purple Rain | Rain | Halloween (1978 film) | Rain or Shine Elasto Painters | Rain on the Roof | rain | Purple Rain (film) | Halloween: Resurrection | Halloween Is Grinch Night | Douglas Rain | Disney's Halloween Treat | Black Rain (American film) | Black Rain | Wolf's Rain | The Halloween That Almost Wasn't | Purple Rain (album) | November Rain | Fire and Rain | Crooked Rain, Crooked Rain | The Right Attitude to Rain | Rain Phoenix | Rain Parade | Rain on Your Parade | Rain (entertainer) | No Rain | It Ain't Gonna Rain No Mo' | I Can't Stand the Rain (song) |