9. CoD: Black Ops
A less serious addition to the list, this post-credit scene portrays a comical meeting between figures such as Kennedy, Nixon, McNamara and Castro, before taking on the infamous undead horde of zombies. After the primarily dark and serious tone of the game's main storyline, the scene comes as a welcome moment of hilarity and ridiculousness (which, of course, is then followed up by the joy of slaughtering endless waves of the walking dead). Although it had little relevance to the campaign itself, it was certainly an interesting way to introduce the return of zombies.