James Marsden and Cameron Diaz are getting ready to go to bed. They have a short conversation about turning off the Christmas tree lights. As Marsden is bending over to turn the lights out, there is a window behind him. As soon as the lights go out, you see a head start to pop up in the window. You only see the forehead of the person, then the scene changes quickly.
"The Box" was based on a short horror story entitled "Button Button" by prolific and legendary sci-fi author Richard Matheson. Matheson's original story was first published in a 1970 issue of Playboy Magazine. He adapted his own story for the screen in a 1985 episode of the new "Twilight Zone" TV series, but it was significantly rewritten after he submitted it. Matheson was so angered by the Twilight Zone rewrite that he refused to allow his real name in the episode credits and instead used his pseudonym, "Logan Swanson."