Title: Three Act Comedy: Revenge of the Frustrated Writers, or, Harry Potter's Life is Disrupted by Original Characters
Just don't ask. You don't want to know.
Characters: Harry, Hermione, Ron, Gary Stu, Mary Sue
Plot in a nutshell: Mary Sue and Gary Stu (drop-dead gorgeous Americans) come to Hogwarts on exchange. Their exoticness drives the canon characters crazy. Hermione gets a crush on Gary Stu. That gets Ron's back up – until he starts to crush on Mary Sue. Shock, horror, Harry likes Mary Sue too (and who could blame him, being a sixteen-year-old boy who seems to crush on pretty girls – exhibit A, Cho Chang) and so Harry and Ron have a fight and become very competitive as to who Mary Sue will go out with. Gary Stu and Mary Sue leave after a month, and tell the Trio that they needed the damp, pneumonia-inducing air of England to realise that they love each other. Ron and Hermione are devastated and take solace in each other's arms while Harry sees Ginny, widens his eyes and jumps on a broom to try to impress her.
Some friends of mine in my computing class are in the drama club and asked me to write something HP-related for them to act in (they caught me on the Harry Potter Lexicon). Anyway, this is the result.
They didn't understand half the jokes. Oh, and the title of the fic is a pun on Agatha Christie's Poirot novel, Three Act Tragedy. They didn't understand that, either.