http://www.homedsgn.com/2012/04/27/ppdg-penthouse-by-hernandez-silva-arquitectos/
That's a big SPLASH drop
Certainly wouldn't have to worry about splashback!
Gives a whole new meaning to the phrase 'dropping a log'
If you were at the bottom looking up would you see a crack ?
That would certainly fix any "blockage" issues if you were scared of heights.