It’s dark. Suddenly, someone -- or something -- lurches forward. A scream erupts from your throat, but then you realize it’s just an actor at the local haunted house. These responses cause arousal. Frank Farley, a faculty member at Temple’s College of Education said that it is humans’ fascination with macabre that drives people to scare themselves. “Throughout our history we have been enamored by the dark side,” he says.