Foxy Lady:   Once upon a time there was a little boy.  And he was fishing down by the pond when he spotted a frog.  He decided to catch the frog and as quick as a flash, he grabbed hold of the frog.

The Frog said:  "Wait sir; If you let me go I will grant you one wish.

And so the boy let the frog go. ;)

But you have to add to the story and change the words around so some of it's backwards  ;)