The producers of The Last Exorcism II movie have ways of making people see them; mainly by scaring them before ever get into the theater.
A promotional stunt for the face-palmingly titled The Last Exorcism II shows viewers its hand up front, opting instead to freak out the customers at a beauty shop. An acrobatically inclined woman wearing dead-person makeup and a nightgown hides behind a mirror that becomes two-way when illuminated.
Over the course of their visit, some of the women getting treatment see a flash of dead girl in their own reflection.
Check it out: