I would have to say "The Raven" by Edgar Alan Poe....
Once upon a midnight dreary
While I pondered weak and weary
Over a quaint and curious volume of forgotten lore
While I pondered nearly naping
Suddenly there came a rapping
As if someone gently tapping
Tapping at my chamber door
Onlt thsi, and nothing more....
Well , gee if you read the entire poem, it is like a weird twisted story about a man and his long dead lover. It is weird and creepy. Also, I had to memorize the thing for a poetry class, and it never left my brains' data base. I love the poem because it tells a sad story. It desribes how painful the grieving process is. If you have not read it, I do recommend it.