When I worked night shift, we used to have to walk through an old nursing home building to get to the new nursing home to do portable X-rays. One day, someone had set up a mannequin in a wheelchair in the doorway and had its back to the hall. Scared the crap out of us, but then it became this game of hiding this mannequin and making her pop up in random places until someone got really scared and locked her in the closet. We named her Janice.