To borrow a John-ism: oh my goodness! You're either about to hate me forever, or laugh and offer to buy me a cupcake. Whatever the hell Nyan cat is, it's clearly a meme of terrifying scope. The original video's been viewed 46 million times, and now it's been snuck into Unreal 3 as a mod for the Redeemer. Just look.
I know, you must have it, right? Who wouldn't want to destroy a Dark Walker with a flying, rainbow cat? Here's where you can grab it.
Via David Hayward's Twitter feed.