Hmm, I've this experience while i was in Secondary One.
Back den my class would ask out form teacher to tell us a ghost
story whenever time permits. (My form teacher when i was in sec
one, teaches me Maths and P.E)
On this particular day, i had my Home Education (Cooking and Sewing
Class) lesson on cooking.
Ok, the layout of the kitchen is quite simple. When u enter the
kitchen, a whiteboard is directly in front of the door, facing
towards the right. There are 2 columns, 5 rows of tables in front
of the white board. The sinks are located beside each of the 2
colums of tables. There are 5 sinks in each sides and just beside
each sink is a rack to hold the dishes and utensils after they're
washed. The racks are placed leaning against the wall.
We gathered in front of the whiteboard, as instructed by the
teacher to see her demonstration. Ok, here comes the scary part. My
LEFT EYEBROW began to twitch out of the sudden. I, whom stood at
the sinks on the left, turn my head and looked at the sinks on the
right. (Dont ask me why. It just happened.)
Suddenly, the racks at the extreme end fell. The whole class was
startled. But as usual, we'll go "Woa!" and laugh it off. Den, the
rack beside it dropped as well. The class gets noisier. Den after
dat, i think u all should have guessed, the 3rd rack fell. My
teacher began to mumble some nonsense. I can still remember clearly
she said "If something is bound to happen and you cannot stop it
den dont.". Tne 4th rack fell.
At that point of time everyone wasn't interested in her
demonstration anymore. We were just amazed and discussing the
events that had just happened. But class still resumes la.

The very next day, we told our Form Teacher about it and den, 2 of
my classmates said something which he kept to himself for the day.
They were standing just in front of the sinks on the right. After
the 4th rack fell, 2 of them saw someone in white floating pass and
disappear. The people standing near the sinks on the right also
felt chill air blowing against them out of the sudden.
From that day on, no more ghost stories were heard from my form
teacher. 

Cheers.
C.K