Actually that’s not true – Budhists for example are not concerned with pursuing happiness because they feel that like all emotions, happiness comes and goes. They try to be equanimous (from the word equinimity: eveness of mind or temper about all things).
The budha believed that all suffering is caused by craving and aversion. We crave feeling happy, love, money, sex, warmth etc. and we have an aversion to pain, suffering, cold, lonliness, etc. He believed it is this constant seeking or avoiding that causes us to suffer.
Nothing, of itself, is good or bad, only your judgement makes it so (this is not the same as advocating amorailty but this is not the place for that conversation).
One thing that I like about laughter is that it helps you put things in their place - to accept what has happened and laugh it off thereby increasing your equnimity.
A couple of parting thoughts: