Showing empathy?

Yesterday, while I was watching TV, there was an emotional scene of a cancer striken mother final moments with her son. Tears started welling up at the corner of my eyes when suddenly, a piece of tissue was thrust at my face. It was Yiu Yiu, who then proceeded to sit on my lap, as if to comfort me.

“Awww, that’s so sweet” right, coz that's what I thought that to myself too.

Just to be sure that she has indeed developed a sensitive trait, I asked her,
Mummy: Why did you give the tissue to mummy?”
Yiu Yiu: Because I ‘wat pei see’ mah. There, see the ‘pei see’.
I almost fell off the sofa! Turned out mummy syiok sendiri.

For the benefit of non Cantonese speaking readers, ‘wat pei see’ means dig my nose, so I’m sure you can figure out what was in that piece of tissue she gave me.