Cosette founds this in an issue of Popular Mechanics from two years ago. And I went searching just because I had to see this in action for real:
The thing weighs 700 tons and has been around since 1962. It's the only ship to be able to do a handstand. And far be it for me to ask silly questions, but if the galley can right itself as the ship is flipping, wouldn't you want the shower and toilet to the do the same? And we don't see them manually adjusting the shower, do we? Do they take sponge baths while in vertical mode?
But hey, added bonus: we'll be able to get a few more futile seconds' warning about the coming of you know who.