When I am a speaker on conflict management I discuss techniques to calm down an angry or aggressive person.
When someone is hostile or angry, the first thing you may want to say to them is calm down. However this is likely the worst thing you can say; it will just irritate them more.
In the face of anger, it is hard to keep your perspective, remain calm and not get emotionally embroiled in the animosity. With some simple communication techniques you can stay calm and collected and effectively talk people out of anger.
Here are some things to say to disarm angry people: