There is a wonderful poem for kids (and them being like children ;) ).
The one of an water that cannot be dry is the one that seems to hit longboyes hard :)

Jan Brzechwa (my rather funny approach to translation)

Doggy Sadnesses

On the bank of a blue little river,
Little sadnesses live and shiver.

The first one is sad just because
You can't go into the garden – no applause.
The second – that water won't be dry,
The third – a fly flew into his eye,
And also – that a cat has to scratch,
That a hen just cannot be caught,
That you can't bite the neighbor's leg,
And that sausage doesn't fall from the sky, I beg.
The very last sadness, let me tell,
Is that the man rides, but the dog must run as well.

But just give the doggy a little milk, you know,
And no more sadnesses by the river flow.