This mini-epic finds Hong Kong's most independent-minded auteur in thoughtful mood, contemplating the accidents of fate and the vagaries of free-will from the other side of the U-bend. Thoughtful, but as playful as ever. It all begins in an unusually clean public toilet in Beijing, the birthplace of Dongdong, who consequently has to live with the nickname 'God of Toilets.' Now 18, he's faced with the impending death of the kind old lady who found … meer