A slow buildup can create suspense in scary movies. In “Children of the Corn” (1984), it creates boredom, and time to wonder how a dimwitted young doctor and his girlfriend (gorgeous Peter Horton and gorgeouser Linda Hamilton) were able to string so many bad decisions together. It’s not their fault a small town was co-opted by a possessed cornfield for a reenactment of “Lord of the Flies.” But who drives from Illinois to Seattle by way of Nebraska? Even I-29 avoids Nebraska! But like the TV commercial says, bad decisions are the soul of mediocre horror flicks, even Stephen King’s.