Whenever a new gadget appears, you can be sure it will be demonized in popular culture. Gothic novelists wrote about haunted typewriters. There were Twilight Zone episodes about evil electronics and telephones that went straight to grandma's grave. There were movies about cursed computers long before there were PCs (HAL 9000, anyone?), and there are countless straight-to-DVD flicks about eerie cellphones.
But it used to be that those hauntings were involuntary. Nowadays people are willingly downloading the ghouls, ghosts and goblins themselves, usually at about a buck a pop. Follow the jump below for our 15 favorite scary iPhone apps.