I Learned this from a very tiny set of books of rhymes and limericks. My grandmother started teaching me to read when I was about 4 and she bought me the books to use to learn how to read and I have never forgotten this one; additionally I still have those tiny books

A flea and a fly in a flue
Were imprisoned, so what could they do?
Said the flea, “let us fly."
Said the fly, “let us flee”
So they flew through a flaw in the flue.
note: (a flue is a chimney for those of you who don't remember)