New rule
Allow yourself to be upset for 15 seconds. If you're upset longer than that, it's your problem.
Got this from Vera F. Birkenbihl
Discussion
Breathing is also a powerful tool. Just a few slow, deep breaths can lower stress, slow your heart rate, and help you think more clearly.
„You cannot be angry without first blaming someone; and the moment you blame, you lose all understanding.”
Jiddu Krishnamurti