[PavlovsCat]

The future? What about the past?

Washing your butt so it's clean = yeah, that's pretty cool.

Eating the right food (and being lucky to have good digestion) so that normally the paper you wipe with comes up white = priceless.

Of course you'll have to wash your hands, but still, we're not hardwired to make a mess every time we defecate. Maybe you could say that's excessive smoke indicating the engine isn't running right. Japanese toilets aren't a fix, they're a workaround.