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The most common tendency of people I have come across is "giving ads", or in simple word boasting!! Gone are the days when people would just relentlessly go on and on exaggerating about their accomplishments or that of their near ones, thus diminishing the interest of the listener :P!! The art of boasting has evolved over the years. It has become more subtle :D. And the main purpose of this is to retain the attention of the listener....
One thing that remains constant about boasting is that it is extremely contagious. Once a person starts boasting, the listener wouldn't stay behind for a long time :D! I,however, refrain from it, when I am at the listener's end. I believe when the listener too takes part in it, the speaker becomes overcharged and then once again says something to override the listener.
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But this doesn't mean I discourage boasting!NEVER!!!
Boasting is extremely healthy. It makes one feel good and helps replenish one's energy and self confidence :D! But once you find your listener participating in it too, the wise decision would be to stop ;)
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Boasts are never meant to be taken seriously!! Just listen to it from one ear and take it out from the other.
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Anyways, as the title says....Boasting is an art. A person knowing the art has the power to overawe people while someone lacking it may end up disgusting others! So, BOAST AT YOUR OWN RISK :D