Anway, the practice of spray-painting trains can be traced to New York in the 1970s, when modern graffiti artists broke into subway yards to 'hit trains', usually along the sides of the cars. Unfortunately, the talented individual pulled his trick at the wrong place and at the wrong time. Not surprisingly, the authorities were quick to slap the "vandalism" label, citing terrorism experts who were concerned about the "breach of security", which comes at a time when public transport networks are viewed as potential terror targets. Just last month, it was revealed that the Orchard MRT station had been a possible terror target.