For reasons only Hideo Kojima will understand, toilet humour has become a staple of the series just as much as silly codenames and cardboard boxes. In every MGS game, you will at some point run into someone unexpectedly answering a call of nature. For reasons that actually become a significant plot point in MGS 4, it's usually the long-suffering Johnny Sasaki. It was taken to a whole new level in MGS 5, which may very well be the only game ever to feature real-time horse pooping. Even after all these years, MGS continues to be at the forefront of innovation...