Sadness
It’s okay to feel sad. Sometimes you cry and feel so much better afterwards. It is a fundamental part of life to be sad from time to time.
You can’t always be Happy.
I watched the King’s Man movie and felt sad. The reality of WW1 was horrible. That people train their whole lives, only to randomly get shot by a bullet on the field. Death just arrives like that. See 2022-02-11
How to trigger this emotion
Think about your Trivial existence.