Film historian Linda Badley explains that the film was so horrifying because the monsters were not creatures from outer space or some exotic environment, "They're us."
」 電影史學專家琳達·貝德莉（Linda Badley）解釋說，本片讓人如此的害怕，是因為那些怪物並非是來自於外太空或異國的產物，而是因為「他們就是我們。