For me, one of the most perfect times to watch a horror movie is when it's cold and raining outside and there's pretty much no outdoor activity to be done. It kind of sets the mood.
When a man lacks mental balance in pneumonia he is said to be delirious. When he lacks mental balance without the pneumonia, he is pronounced insane by all smart doctors.
People are afraid of things they don't understand. They don't know how to relate. It threatens their security, their existence, their career, image.

