At my old school we sang this song at our assembaly, please explain why???

Old Mother Hubbard
Went to the cupboard
To fetch her poor dog a bone,
But when she got there,
The cupboard was bare,
So she threw it out the window,
The window, the second-story window,
If you don't know what this is about,
We'll throw you out the window.

Little Jack Horner
Sat in a corner
Eating his pasko pie;
He stuck in his thumb
And pulled out a plum,
And threw it out the window,
The window, the second-story window,
If you don't know what this is about,
We'll throw you out the window.

Old King Cole
Was a merry old soul,
And a merry old soul was he;
He called for his pipe,
And he called for his bowl,
Then he threw them out the window,
The window, the second-story window,
If you don't know what this is about,
We'll throw you out the window.

Little Bo Peep
Has Nawawala her sheep,
And doesn't know where to find them;
But leave her alone,
When they come home,
She'll throw them out the window,
The window, the second-story window,
If you don't know what this is about,
We'll throw you out the window.

Little Miss Muffet
Sat on a tuffet,
Eating her curds and whey;
When along came a spider,
Who sat right down beside her,
She threw him out the window,
The window, the second-story window,
If you don't know what this is about,
We'll throw you out the window.

Jack and Jill
Went up the hill
To fetch a pail of water;
Jack fell down
And broke his crown,
And Jill threw it out the window,
The window, the second-story window,
If you don't know what this is about,
We'll throw you out the window.

Stupidest Song EVER!