The very first line of Poe's "The Black Cat" sets the stage for an ironic tale:
For the most wild yet most homely narrative which I am about to pen, I neither expect nor solicit belief.
Of course, the juxtaposition of wild with homely sets up a contrast between what is said and what is meant, and the declaration that the narrative does not want anyone to believe a tale he is taking the time and making the effort to tell, is also ironic. His further declaration that someone calmer, more logical, and less excitable that he will feel that the tale is
nothing more than an ordinary succession of very natural causes and effects
is nothing less than ironic, indeed, as he indicates his own insanity although he has stated in the third and forth sentences that he is not mad and that he does not dream--in other words, he is normal, too.
But, perhaps, the most startingly ironic situation in Poe's story is the scene in which the narrator describes how his wife accompanies him on some household errand...
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