People like thrill. they like not knowing what is going to happen. it kind of creates drama. something around that. also it affects you physically. your heart rate increases. you may even experience sweating
They speak to our irrational side. They free our imagination and make us childlike. They allow emotion to triumph over reason. They remind us of the problem of evil. They take us out of the safe, everyday world. They stir our curiosity and excite us. They cause an adrenaline rush. They make us imagine the most dire ending.