Secret Code

What does 0-1-2-3 means ?

I merely use this code on Aston many weeks ago.

I ask "Aston, how are you today, are you 0,1,2 or 3 ?
He replied me "Mummy, I am 3 today".
My reply " Oh oh, why 3 ? Why happen to you that you are so naughty ?

Aston decode them in this way. We find it very reasonable decoding by him as he is able to link them well to his behaviors.

0= did not misbehave, very obedient
1= a bit naughty and very obedient
2= naughty and a bit obedient
3=very naughty