As someone who loves zombies almost as much as I love Lord of the Rings, this is certainly something: it's a Left 4 Dead map made to look like the fortress of Helm's Deep.
It's not exactly canon for either franchise, I'll grant you that. The music and ramparts don't exactly scream "zombie infested urban environment", while the machine guns and health packs aren't exactly the epitome of high fantasy.
But hey, it's a video game. Let's roll with it. If you like what you see, you can download the map here.
[via PC Gamer]