A TEENAGER hurled acid in a stranger's face in a bizarre attempt to cement his friendship with a man he had met only once. His victim was a young woman who had ended her relationship with his new 'friend'. Ng Shing-mau, 19, said he attacked her to avenge the break-up. He was sentenced to nine months in prison after a judge found him guilty of throwing corrosive fluid with intent to cause grievous bodily harm. 'The reasons for which the defendant committed this offence were strange,' Judge Whaley said in the District Court. 'The victim's previous boyfriend had met Ng, and over a few drinks described how upset he was about their relationship coming to an end.' The judge went on to describe how Ng had shown an 'unusual interest' in Lam Chi-kin's plight. When Ng asked Mr Lam, 20, if the girlfriend was pretty, he told him to go to her office and see for himself. Mr Lam had no idea his new acquaintance would arm himself with a bottle of hydrochloric acid before setting out to meet her. Ng lay in wait until Candy Chan Ka-lai, 21, emerged from the building. Then he flung the fluid in her face. Colleagues saved Ms Chan from permanent scarring by rushing her to the nearest sink and washing the acid from her face. When Ng, a heroin addict, telephoned Mr Lam to tell him how he had taught his ex-girlfriend a lesson, his new friend responded with horror. Ng then turned nasty, threatening to tell police that Mr Lam had instructed him to throw the acid. Before passing sentence, Judge Whaley observed that a psychiatric examination had failed to uncover any form of personality disorder.