"Window Seat" -- Airplane toilet with a view

The other day when I was flying back from Beijing to HK on Hong Kong Airlines, I saw something I have never seen before in all my years of air travel...  an airline bathroom with a window! 

(has anyone seen this before?)

It was an Airbus 330,  the bathroom between the business class and economy class sections (between row 5 and 6 I think).    Quite distracting actually.  I wanted to take my time and enjoy the view. :-P