All manner of monsters prowl the halls of the Sioux Falls Jaycees Haunted House. Sadistic clowns smile from shadowed corners, herding visitors into a blood-spattered room where a ghoul in a straitjacket waits. Strobe lights and fog convince the senses that they've entered an otherworldly dimension or a very dusty camera, concealing the ghastly robotics and props lurking around each bend—such as a leering, demonic child named Hex. Though the attraction seeks to terrify, its ultimate goal is far more altruistic: ticket profits go to the Sioux Falls Jaycees, a community-service group whose volunteers don masks and gallons of fake blood to staff the entire house.