Last month, a video of a mainland mother clutching a nappy as her toddler squatted and urinated into it on a street in Mong Kok went viral. It's a scene not unfamiliar to parents of young children the world over (when a child's gotta go, a child's gotta go) but the video became yet another flashpoint in what was already a tense relationship between Hong Kong and the mainland. That incident ended in a scuffle, which led to the arrest of the mainland parents and caused an uproar, both online and offline, in Hong Kong and the mainland. The story I am about to tell you is of yet another child answering the call of nature in public. This time the setting is the Hong Kong international school at which my five-year-old son, A, is a Year One student. A has just finished his first swimming class and I am at the school helping him shower. As he washes, X, a Year One classmate, comes over and asks me if he can join A in the shower. Noticing the little lad is wet and shivering, I say, "Yes, of course". The boys laugh and splash around under the warm water. So far, so fun. Then X turns to his mother (who is most definitely not a mainlander) and asks her something in Cantonese, to which she nods in the affirmative. X then proceeds to pee right there in the shower, through his trunks, with A standing close to him, as I watch, agape. X's mother is looking on with a sheepish smile. I am horrified. Why would a Hongkonger do that when a urinal is less than 10 steps away? I quickly pull A out of the cubicle. There is no video - and so that is where the story ends. Or does it? Might even this little episode get blown out of all proportion?