Things that are opposite
Ex: Jumbo shrimp
Shrimp could never me jumbo
Ex: Bitter sweet
What do you mean? do you mean as in, something people in general do enthusiastically, or me personally?
The title of the story includes the word fall which foreshadows the ending of the Usher family line. The decreped state of the house described in the begining foreshadows the dissolution of the Usher family.