Violence
Violence is apart of life. Anger can even bring about violence. I think here, you would have to consider the source and reason for the violence. For example, if the violence is for entertainment, even at the expense of human life (think of the Roman Gladiators), then it would clearly be unacceptable. However if the violence is for a protective reason, such as you are attacked and are defending yourself, then this violence would be allowed. With this, it is best to use your best discretion and avoid anything that is unneccessarly violent or gory.