Two teenage boys went on a knife-wielding spree in September, in what seems to be totally unprovoked attacks, The Straits Times reports. Just past midnight on September 14, 18-year-old Muhammad Taufiq Mohamad Raffi and his 19-year-old friend Sivaraj Manickam were totally unhappy at a group of youths sitting outside a McDonald's in Hougang, whom they thought were staring at them.