7. Turkey Assassin - Assassin's Creed III
How It's Activated: Make it to Sequence 6 or later in the game, and then return to Davenport Homestead, before walking to the right hand area of the building. Hide around the back corner and whistle to rouse the titular turkey, and then go up to it, press Up, Up, Down, Down, Left, Right, Left, Right, B, and A (Xbox 360).
What It Does: Said turkey is now kitted out with a hilarious assassin's hood, and will hang out with Connor for the foreseeable future. Though ultimately a pointless cheat in terms of "breaking" the game or advancing your progression, it's a reminder that Ubisoft really does have a sense of humour despite the frequent self-seriousness of their popular series. Plus, how cute is that hood, right?