Acknowledge the anger that you are feeling and tell yourself that you are now going to deal with it.
This is often easier said than done. How many times have you flown into a rage once your anger took hold, only to feel regret for the outbirst afterwards?
Find a circuit breaker to stop yourself from exploding the very moment your anger starts to take control. It might be digging your thumb nail into your finger, clenching your fist, something physical to breathing deeply.
This will give you time to recognise you're angry, acknowledge the anger and bide time to breathe and take control.