missing!

Haiz..
Tell you something funny!!!
It may be funny in the beginning but its not at all in the end!!!

First, let me ask a question.
What happens if one day you woke up late for school and you find the things that you rushed out for half an hour late at night missing?

Yesterday night, I went home after work, I did the materials for my science lesson plan with the help of my sis..
A pendulum.. took me so much effort for the children..

Happily, I went to sleep!!

The next morning, I woke up quite late, and was rushing to childcare.. I went to my bag and hooooooo guess what?
The pendulum and all the materials I put into the paper bag on top of my bag was gone..
The whole paper bag went missing..
(For a moment, i thought that i sleep walk and took it elsewhere)

Hmm.. I searched high and low, called my sis, and did everything I could..
But i just could not find..

I hope sooo ssooooo much that it is not thrown away by my mum..

But it sooo sooooo happened that my mum thought everything inside my bag is supposed to be rubbish..
And she threw it away...

I really dun wish to be angry.. but she really is the only person that can make me angry...

Not to mention that, she did not even apologize, instead, she shouted at me and said I didn't told her its not rubbish!!

What can I do?
Shout back?
Sue her of intimidating privacy?
Or continue being a coward?

I really dunno la.. haiz..