The problem of agression of young is very actual nowadays. Problem of bullying is one of the most important at schools. A lot of teenagers trear other people agressively. I think that this problem shouldn`t be ignored. I guess that there should more specialists like psychologists working on this problem. School bullying may cause unfortunate consequences which may even result in a tragedy. Cyber-bullying is also an aspect of agressive behavior of people of different ages but mostly teenagers. That may be even the only way to get rid of their problems. In conclusion I`d like to say that the most part of teenage aggression is tightly connected with the relationships with their parents. So, they are the very cause of teenagers` casual behaviour.