Our dear friend Helmboy alerted us to what is commonly acknowledged to be the worst fanfic ever written: it's called My Immortal, and it's Harry Potter fic (sort of). Reading it will break your brain, but you'll be laughing hysterically as it happens. It's filled with weird text speak, LOLcat language, and crazy misspellings, like "Enoby" for "Ebony" (the goth Mary Sue heroine).
The site where it's currently hosted also has a link to a dramatic reading of Chapter 17, posted on YouTube. It's done by a professional voice-over guy and it's unbelievably funny.
Make sure you click through to YouTube and read along. You'll be glad you did.