The excrement that is flushed away in Canadian toilets each day is the world's "most underrated, limitless resource,'' says the creator of a new museum exhibit that delves into one of humankind's messiest subjects. Coline Niess of the Musée de la civilisation in Quebec City says the upcoming exhibit titled "Oh Shit!'' will explore all the facets of human waste — and that it's not a laughing matter.