Fanfic: The Quest for the Holey Grail
The Quest for the Holey Grail (yes, Holey) is a ridiculous multi-fandom crossover written by KingAurthr (later known as KingAurthr2), a mysterious figure who appears to be approx. six and a half years old, and rife with major spelling, grammar, and plot mistakes.
The story begins with King Arthur (Aurthr,Aurthur,Aurther, etc) and Lancelot getting a message about the 'Holey' Grail, and culminates in a massive epic battle between the "good team" and the "drak ones". Along the way King Arthur meets up with Harry Potter (Didn't you know? "Yes, the grail is atually the goblet of fire from the harry poter book", and yes, that's an actual quote), Hagrid, "indian Jones" (otherwise known as Indiana Jones), "the lord of the rings people", Doctor Who, "professor snake" (a character who can only be Professor Snape), and inexplicably, Scooby Doo and the Mystery Machine. The "evil team" has an equally eclectic mix of characters that includes the "lick king from Wrodl fo Warcraf", "Voldermor", Sauron, and the "russian woman from indian Jones and the crystal skull".
Of course, it has all the makings of a terribly awesome fanfic including time travel, out-of-character plots, killing characters off for little to no reason, leaving basically everything unexplained, and doors made from skulls, bones and dead bodies. The finished version of the story can be found here: 
This fanfic provides examples of: