Humans have plenty types of emotion.
Happy, sad, angry, etc.....
Our emotion changes from time to time.
It sometimes can change rapidly,
even with only half second of time.
We can't avoid to have good emotion all the time.
When bad things come to us,
it can influence us easily.
What can we do is just trying to maximize our good emotion,
and minimize our bad emotion.
Wish your emotion is good today.
Have a nice day!