I catch the train every day and there will quite often be young people (usually guys) playing crap music out of a mobile phone, being loud and annoying or other antisocial behaviour. As this place seems to be about being a man and a positive role model as much as it is about getting laid or standing up for yourself what are the best tactics for getting them to behave. I've tried telling them to shut the fuck up before which works for one on their own but a gang is usually more threatening and belligerent.