Siyona makes up a joke and a song..

This is super cool, according to me. Two separate incidents.
First one. Today I asked Sia (like I have done a million times), "Mumma ka baby kaun hai ?" Usually the answer is "Sia".  Today she says; with a very mischievous smile; "Sumeet". It was almost like she was trying to make a joke.
This conversation took place during bed time. There is a nursery rhyme that goes like this:
The farmer in the dell
The farmer in the dell
Hi-ho, the derry-o
The farmer in the dell
I made up something for her.
Sis goes to bed
Sia goes to bed
Hi-ho, the derry-o
Sia goes to bed.
She came up with the addition of 
Baby goes to bed
Baby goes to bed
Ho-ho the derry-ho
Baby goes to bed.
Then Sumeet came in to say goodnight. Since he is traveling tomorrow, he was telling her that he will be leaving in the morning, he will be back on Friday etc. She suddenly starts singing -
Papa goes away,
papa goes airplane,
Hi-ho, the derry-o
papa goes airplane. 
Both of us were stunned. She made up the whole thing!