Rhyme
Silly boy, silly Billy, On the dark hill. Thunder's for company, Rain is for thirst,
Lightning to show the path Down to the valley, Where rivulets spill Limpid monotony.
Oh for my Billy boy! Billy boy oh! Under the apple tree, There do not go.
There is a folk legend that children who are left under an apple tree will be stolen by fairies and replaced by a changeling. And of course you do not shelter under a tree in a storm. A deliberate attempt to be child-like.