The first time you visit Montsaye High (the very first level), after freeing the ghosts and the intermission sequence with Hawksmoor and Anna in the attic, but before you go there, go to one of the classrooms that appears to be a science-type room. On a table near the window is a television and slide projector. Approach the projector and an option for action appears. Press this button to see a mysterious shadowy figure. Press it again to see another image. Keep doing this until you return to the original slide.