All great journeys.....
I think that when we grow up and learn that happiness is rare, and passes quickly, we become disillusioned and hurt. And how much we suffer is a mark of how much we have been hurt by this realization.
Children are good at making two faces at once you know ... a contradictory expression that that they master like they are afraid and happy at the same time.
If fate does not make you laugh well then you just don't get the joke