I remember one particularly bad one when i was wandering around
in shanghai .....
It's something like the second chinese pic up there ... except it's
just a long open drain with a raised concrete platform on on side
.... no partitions .... when i paid my 3 yuan (yes, knn, had to pay
also ... ), took my cardboard like toilet paper and walked in ...
there's another chinese bro squatting there, with his pants down
and didi hanging, reading a newspaper ... with a brown snake
halfway down to the drain ! .... 
