And then I tried to imagine how scary the movies would actually be. I had to imagine that factor because my parents are good ones, and they would never have let me see R-rated movies at the tender age of nine. So if I was going to *know* about these horror stories...I had to read the books.
The advertising from both films, as you can see from images above and below (in the trailers), highlight images of eggs, and something evil growing inside an egg. I think that was probably the key scare factor for me at age 9. Something horrible was going to hatch in both stories.