Think Out Of The Box

Kid : I want to comb my hair myself.

Me : Ok, get up on the stool and you can look at the mirror.

Kid : No need. 

Me : ?

The kid turned and look at his shadow on the wall.

Kid : If I see the hair standing up (shadow on wall), then I will comb my hair down so that it will be nice and neat.

Wah, quite smart hor, I never think of that :)