During my trip back to Balai, I heard about one incident.
One fine day, during school time, all the girls began to cry.
And they (the adult) concluded the girls had been possessed (by ghos, of course)
However yesterday, I just read an article about an syndrome that portrayed a similar event. The difference they called it Mass Psychogenic Disorders (not the ghost possessed nonsense).
You can read the article here http://health.howstuffworks.com/collective-hysteria.htm
This article presented a similar situation in my place. Or simply they just being naughty. Who knows?