Close your eyes, take a few deep belly breaths and imagine yourself at your favorite and most relaxing place, whether real or imagined: perhaps an island, deep in the forest, a hammock on the beach, in nature, walking in the mountains, just to name a few. Make it as real as you can, using all of your senses to make it feel even more vivid and alive. Luxuriate in a deep and growing sense of relaxation for a few minutes. Take a mental snapshot to remember it. Take a few more deep belly breaths and slowly return to the present.
2. Help Someone Else
This could be as easy as paying the toll for the next car in line, to making a charitable donation (of money, food, clothing, or your time) to your favorite cause, to giving your already paid parking meter receipt to the next person parking or buying a coffee for the next person in line at your favorite coffee drive-thru. That happened to me recently on a particularly stressful day and it totally changed my day and put a big smile on my face for hours.
We all forget to breathe when stressed out, angry or feeling overwhelmed. Taking some deep belly breaths in a mindful manner will help to change your mood and perspective easily and quickly.