Rewrite Edgar Allan Poe's "The Raven" as a short horror story 400 words or less and make it about another animal. Make the mental imagery as ridiculous as possible but still write it as though a serious story, not a comedy.
The skies were dark and ominous as the clock hit midnight. An unread pile of books stood on my desk, daunting in its height as my head drooped in exhaustion. Just as my eyes began to close, a gentle tapping started to sound at my chamber door. 

"It must be a harmless visitor, nothing more," I muttered, my mind not yet nimble enough to realize that a visitor would not come unannounced inside my house to knock on my chamber door. Perhaps I can blame it on the bleakness of this December day, where each dying ember in my fireplace seemed to echo the ghost of my lost Lenore, her rare radiance gone forevermore. 

"It has to be a visitor. Just a late-night visitor come to find me," I repeated, trying to soothe the terror in my beating heart. These words seemed to give me courage, and I opened the door wide. 

"I'm sorry to keep you waiting. I was asleep, you see--" But my words greeted only nothingness outside. Afraid and perplexed, I peered into the darkness, my imagination filling the blanks of the silence.

"Lenore?" I whispered.

"Lenore!" A soft echo and nothing more.

Back in my chamber, I had only sat down when a louder tapping came from my window. 

"This must be the wind and nothing more!" I comforted myself as I flung open the shutter. To my shock, a black-furred creature broke into the room, its large body breaking through the window frame. Once, twice, three times it rolled and tumbled like an acrobat before it raised its head. It was a stately panda! With great leisure and composure, it made its way to the chair by the fireplace and sat down, its weight breaking the chair's fragile frame.

"Any other visitor who broke a chair would leave immediately. Surely he will too."

Quoth the panda, "Nevermore."

I didn't understand why this creature came. "If the Gods or angels sent you, forget this lost Lenore!"

Quoth the panda, "Nevermore."

"If the Devil or Temper sent you, tell me if there is balm in Gilead?"

Quoth the panda, "Nevermore."

"Whether Devil or God-sent, tell me if I'll ever hold the beautiful Lenore again?"

Quoth the panda, "Nevermore."

"Leave me! Leave my loneliness unbroken!"

Quoth the panda, "Nevermore."

And my soul from beneath its dark shadow shall be lifted - nevermore!