>>280563521It's a short story in another book by Stephen King. Night Shift I think. Anyway the story is about a lawnmower man that turns out to be a satyr and then eats the homeowner. I don't remember it being very good so it being changed from a shitty story to a shitty Flowers for Algernon ripoff movie didn't bother me much.
To be honest the original story is more like anime than the movie.