Customers 'do a runner', leaving $1,700 tab A group of customers sang and drank for about four hours in a karaoke bar in Yau Ma Tei, ran up a $1,700 bill and then left without paying. Four of them assaulted two other customers, a man and a woman, after accusing the pair of staring at them and blocking their way as they fled through the lobby of the karaoke bar on Nathan Road, police said. The couple, both aged 26, were discharged from hospital. Two men convicted over substandard piling scam Two men were convicted of defrauding the Housing Authority in a piling scam involving a Tin Shui Wai Home Ownership Scheme development. Wong Shun-wah, 37, a quality control engineer employed by B + B Construction and To Man-kum, 32, assistant clerk of works, were found guilty by a jury in the Court of First Instance of conspiracy to defraud between October 1996 and February 1997. Five other defendants in the trial were cleared of all charges. Mr Justice Pang Kin-kee adjourned sentencing until October 31 pending background reports. Taxi driver sees double over licence plates A 45-year-old taxi driver in Mongkok was shocked when he spotted another taxi carrying the same licence plates. He told police, who later intercepted the taxi and arrested the driver, 41, who was detained for questioning. The elder taxi driver told police he believed the licence plates on the other taxi, which has been impounded, were stolen from his vehicle in August. Three trucks collide A section of Tuen Mun Road near On Ting Estate was closed for more than half an hour after three container trucks slammed into each other. One of the drivers, 39, suffered slight hand injuries. Tram driver faints A tram driver fainted after stopping his tram at the North Point terminal. Tang Wai-hung, 49, collapsed to the floor after feeling dizzy. He was taken to Eastern Hospital and is in stable condition.