"you know hor, your class so dirty, and not only have dirt and litter leh.
there are also other ppl's footsteps okay?

there are ppl who go to the toilet, then step on urine.

and worse is that it is not your own urine, is other people's urine.
then you put your bag on the floor where got ppl's footsteps.
then you carry all those dirt and urine home.
then you put your bag on your bed.
then when you sleep, your chin is in contact with the urine.
then your face is all dirty."