Re-Animator was truly a gorefest, but also tongue-in-cheek, so one is laughing through it. Another movie from the same makers, with the same actors, and also based on H. P. Lovecraft was
From Beyond--lots of gore, but not very scary.
Sten: Were you talking about the British Day of the Triffids? Excellent movie, good book too. I read the novel when I was little, but didn't see the movie till when I was in my 20s. Not scary for adults, but maybe for kids. Excellent science fiction premise.
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