There are ten rats to every person in Hong Kong, which ought to make it cool for cats, right? And maybe it is, as we follow our movie-juiced feline around the by-ways of the Fragrant Harbour. I mean, there are cat police and cats are allowed to carry guns there. They even have their own cafes where they talk tough to each other and indulge their contempt for humans. True. They do things differently in other countries.