An unemployed man, 'acting out of craziness', donned a Balaclava helmet and robbed four of his neighbours at knifepoint, a court heard yesterday. The High Court was told Cheung Wah-yah, 34, burst into neighbouring flats in his Aberdeen apartment block brandishing a 30-centimetre knife and demanding money and jewellery. Between April and May he stole cash and jewellery totalling $23,000. Mr Justice Mohammed Saied sentenced Cheung to seven years' jail after he pleaded guilty. Cheung, 'acting out of craziness', had committed the offences 'out of the blue', defence counsel Luke McGuinniety said. 'There was very little forward planning or premeditation,' he told Mr Justice Saied. In sentencing, the judge said the only mitigating factor was Cheung's 'frank admissions' to police.