shouting loudly is primeaval nature since olden days warriors and red indians warcry howl loudly to intimidate the enemy.. but of cos modern day is different, usually is boliao behkan bullies and cowards way of "striking fear" into ppl, the easiest way to deal with them is just calmly challenge them to a fight and usually they will just shrivel away but of cos not without some final parting words the usual knnccb bla bla bla plus middle finger...lol