A dispute between mainland Chinese tourists and locals over a toddler urinating in a Hong Kong street has once again become a flash point in already tense cross-border relations. This time, the dispute ended in a scuffle that led to the arrest of a mainland couple, the parents of the toddler, and a massive online uproar in both Hong Kong and the mainland. Several video clips that have been widely circulated online did not capture the scenes of the toddler urinating, but show the young couple, carrying their two-year old boy, locked in a fierce quarrel with two local Hong Kong young men, as one of whom took photos of the scene at Sai Yeung Choi Street South in Mong Kok.