Army of Two: The 40th Day co-op video is fist bump free

While we must absolutely stress that the above headline is true, it's also misleading. It's true that the video above contains no fist bumps whatsoever; the bulk is comprised of the various co-op tactics that can be performed in Army of Two: The 40th Day, including back-to-back gun play, lifting, hostage grabbing and -- our personal favorite -- mock surrender. That said, there is bumping in the video, specifically the bumping of forearms.

So why the change? What is the social significance of the forearm bump? Is it a sign of greater manliness, or are the characters in Army of Two simply trying to fight the spread of deadly germs? Please, contribute your theories in the comments.