An old favorite.

Mr. Brain was a hermit dwarf who liked to eat shellfish off the moon.
He liked to go into a tree then because there is a little height to see a
little further, which may reveal now the stone, a pebble — it is a twig,
it is nothing under the moon that you can make sure of.
So Mr. Brain opened his mouth to let a moonbeam into his head.
(Russell Edson )