\One of my very known person has a habit .although he is a amicable person he has got one habit He just like some persons thinks other peoples are just ignorant and only he has to inform them When a person meets him after  few minutes he will start lecture them  The other  person out curtosy will hear for some time if  he starts interfere our person will cut shot  him and continue his lecture. At last the other person will abruptly close the conversation Our person will murmur that he has got no manners what kind of world