Believe me, I'm trying as hard I can to not give this subversive parody a real plot, but by the FOURTH chapter that gets pretty tricky. Check it out, I guarantee you'll either laugh or cry.
Taking place in the middle of Harry Potter no. 5, Harry's world is upended when suddenly the whole world seems to be trying to massacre Hogwarts. Harry Potter, HalfLife:Opposing Force crossover.