Scariest movie you’ve ever seen

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Threads.
http://www.imdb.com/title/tt0090163/

I saw this movie when I was 14 and had nightmares for days afterwards. If you ever wondered why the anti-nuclear movement in the UK was so much stronger than it was in the US, you'll know after watching Threads.

Oh yeah, and it has charred corpses, formation vomiting, firing squads, hospital steps dripping in blood, dead babies, people eating raw sheep, amputations performed with anesthetic, and the main character chews off her umbilical cord when no one's around to help her give birth. Everybody dies and the Sun doesn't shine for half the movie. Fun for the whole family!