Perhaps the most interesting aspect could be how the author blends these seemingly disparate elements. Twilight has its own set of established characters and themes. Adding something as odd as a purple banana hammock into the mix must create a really unique setting or plot. It might be a humorous take on the Twilight universe, or it could be a really creative way to introduce a new and unexpected conflict or relationship among the characters.
The title itself is quite interesting. The combination of 'purple', 'banana hammock', and 'Twilight' is very unexpected and creates a sense of mystery. It makes you wonder what kind of story could possibly involve such strange elements.