And it's hard to get that definition of scary in full force, man. The right mixture makes the grade. Anything less or imbalanced, and that verisimilitude gets lost in translation, and you've got what's typically called a "horror-comedy" where the scares actually make you giggle and eat popcorn versus holding onto your seat for dear life.
It's not easy getting that mixture right. And that's why the greatest masters of horror -- Stephen King, Dean Koontz, Jack Ketchum, Wes Craven, Guillermo del Toro, Clive Barker -- they're geniuses of the written word in the best way.
They Get the Mixture Right
And they tell the story with the exact intention they're going for. That's rare in storytelling. Because typically it's a good thing to just tell a story, and everyone's experience of it varies. But a story that only has one intention -- to scare the living Hell out of you -- is truly masterful, and the perfect definition of scary.