It is tiresome to keep on reminding someone that he or she is bossy. Code 13/10 provides a convenient way to do this in a more light-hearted manner. 'A touch of 13/10, I think.' 'It's 13/10 time again.' Often people get into 'bossing' habits and are not even aware that their behaviour is so regarded. Code 13/10 is a reminder. To have a whole speech about bossiness and selfishness on each occasion would be unpleasant and lead to fights. Using code 13/10 simply indicates that your behaviour could be seen in this light. Perceptions are real even if they are not reality.