Some people are legends in their own minds. They convince themselves that they are the center of the universe which should revolve around their desires and needs.
If you think this way, you will generate tons of anger when even common every-day things occur in your life. As an alternative, remind yourself that things don’t necessarily HAVE to go your way. Yes, you would PREFER that they do, but they don’t HAVE to.
Changing your self-talk like this can be a powerful weapon in your arsenal of anger management tools. After all, things happen in your life for many reasons, many of which have nothing to do with you.