I'm an ex-yjcian. I have not seen any
ghost/spirit yet. But one of the school servants had told me that
there are ghosts/spirits wondering about the school at night.
He said though he did not see many, but he could feel their
presence. On one occasion, last year(not on 7th lunar mth), he saw
2 grey figures walking into the hall through the side door in the
late evening after eveybody had gone home. He remembered that he
had locked all the doors.
He also said that ghosts/spirits wander pass the corridor outside
the Principal's office at night frequently.
Advices given to me are: When walking around the school in the late
evening(when few people are around), use your nose and your sense
of feel to help you. If you are walking and you smell something(be
it nice or bad), make a u-turn and try another way to get to your
destination.
While you are alone walking and you feel somebody tap you on your
shoulder or back, never turn your head and look back. Run to a
place where there are people.