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The Stuff (1985)
(feddit.nl)
A place for lovers of B movies to come together and talk about them.
Rules:
I saw just enough of this as a kid for it to give me the screaming heebie-jeebies.
This, Invaders from Mars, and the 1978 version of Invasion of the Bodysnatchers also freaked me the heck out.
Close Encounters of the Third Kind was also terrifying to me. Again, I only saw bits and pieces.