The catch-phrase "do bears shit in the woods" is used to indicate that the rhetorical answer to an earlier question was "yes".
By that logic, "do humans shit in the street" by right would have been the opposite rhetorical "no".
This one above is the ultimate.
Then again, in their defense (not that I condone shitting in the street), finding a toilet in Hong Kong can sometimes be somewhat challenging.
Go to any store and chances are, you will get a blank stare and answer that they do not have a toilet in their premises. It is almost as if the entire street heads down to the McDonald's nearby for their No. 1s and 2s.
The bigger malls are better but locating the toilets can also be tricky. Some malls, and I say in jest, hide the signs pointing to the toilets. You need a very sharp eye to spot them.
Afternote: After reading Arrenn's comments, I realised that I need to explain the context of which this video was taken.
Hong Kong folks have been complaining about Taobaolanders behaving badly when in Hong Kong.
Tension reached a boil-over when a group of Hong Kong folks took up a newspaper full-page colour ad labeling them as locusts.
Read here --> http://blogs.wsj.com/scene/2012/02/01/locust-ad-breaks-in-apple-daily/
and here --> http://blogs.wsj.com/scene/2012/02/01/locust-ad-breaks-in-apple-daily/tab/slideshow/