Once upon a midnight dreary, while I pondered weak and weary, Over many a quaint and curious volume of forgotten lore, While I nodded, nearly napping, suddenly there came a tapping, As of some one gently rapping, rapping at my chamber door. "'Tis some visitor," I muttered, "tapping at my chamber door - Only this, and nothing more."
Ah, distinctly I remember it was in the bleak December, And each separate dying ember wrought its ghost upon the floor. Eagerly I wished the morrow; - vainly I had sought to borrow From my books surcease of sorrow - sorrow for the lost Lenore - For the rare and radiant maiden whom the angels named Lenore - Nameless here for evermore.
And the silken sad uncertain rustling of each purple curtain Thrilled me - filled me with fantastic terrors never felt before; So that now, to still the beating of my heart, I stood repeating "'Tis some visitor entreating entrance at my chamber door - Some late visitor entreating entrance at my chamber door; - This it is, and nothing more,"
Presently my soul grew stronger; hesitating then no longer, "Sir," said I, "or Madam, truly your forgiveness I implore; But the fact is I was napping, and so gently you came rapping, And so faintly you came tapping, tapping at my chamber door, That I scarce was sure I heard you" - here I opened wide the door; - Darkness there, and nothing more.
"The Raven (excerpt)" by Edgar Allan Poe. Public domain.
You'll notice that we break most of the rules. The group was started as a creative outlet for writers and non-writers alike, and is more about having fun than about being correct (although classical haiku is more than welcome).