 Although many found the video humorous and entertaining , others warned that it hinted at a more alarming and sinister prognosis of life in stress @-@ filled Hong Kong , particularly inside buses , nicknamed " flying cars of death " and other overcrowded areas . Lee Sing , director of the Hong Kong Mood Disorders Centre at the Chinese University of Hong Kong , warned that Hong Kong 's high @-@ stress working environments are spawning a city @-@ full of " Bus Uncles " . Lee estimated that one of every 50 Hongkongers suffers from intermittent explosive disorder , turning one into a " ticking time bomb " of rage and violence . 
