Little fly upon the wall
ain't you got no clothes at all
ain't you got no mum and dad
aaah ain't that sad.

or

I saw a little worm a squirming on it's belly
I watched it for an half an hour
and squashed it with my welly.

My mum used to say those to me when I was little. Don't know where they came from either. I always thought she made them up. Mums are brilliant after all!! ;-)