The girls are going to beat you up. チカン"Chikan" is Japanese for molester or pervert. On crowded trains in especially Tokyo there is a huge problem with groping offences. In other Asian countries the ladies carry knitting needles to poke the offenders or the punishments are so severe, that most would be offenders think twice. The problem has been huge in Japan, because ladies didn't fight back and punishments were lax. Not any more! Chikan beware!