You can’t be happy at everyone; there are going to be some days when you are going to be mad at someone for one reason or another. If you are mad, tell the person who angered you what caused you to be so mad without accidentally making yourself madded in the process. By firmly explaining your anger in a leveled tone, you may be able to get closure and an apology from the person who made you mad. If you need to yell, warm the person first so they can be prepared for you to vent properly.