Fool's design.
Office 2013 - Fool Full screen menus, lost at sea.
Menus usually drop down, right? Well, not in Microsoft land anymore. Their handle disappear, they might "close", they might go "back" or perhaps, they might just sit there on full screen, laughing at you, lost at sea.
Clicking on "FILE"-menu makes everything disappear. You get stuck in a full screen, no man's land, guessing your way out of it.
This seems appropriate. The SS Microsoft sailing full speed ahead and ignoring all our warnings ...