It is amazing to have such a strong control over your emotions that the external even lose their meaning and effect on your mood but you tend to maintain the positive emotion in you no matter what happens. Kudos to you for having this quality 👏
You are right that surprises appear all of a sudden but what matters the most is their after effects. For being successful in our lives we need to train our mind so that it do not over react but deal with the situation calmly
RE: The Joy and Sadness, My experience with "SURPRISE"