Difference Between "Fun" and "Happiness"

Don't mix FUN and HAPPINESS. 

We hear the statement: 'Have fun', 'Be Happy'.

We don't get to hear: 'Have Happy', 'Be Fun'!

Why?

'coz, FUN is something one can HAVE, like HAVING meals. It comes from external things like music, party, cinema, jokes, games etc. So, one can pay and get it, if required.

HAPPINESS is something one can BE. You can't HAVE it! It is INFLUENCED by several external factors like fun, spouse, job, boss, finance, circumstances etc. One can choose or let be influenced by the external factors. For ex: When I have lost a loved one, I don't want to BE HAPPY. I let the circumstance influence me. However, if I am letting every other circumstance influence me, I would spend much of my life being NOT HAPPY. 

So, FUN may give HAPPINESS, but, it exclusively doesn't mean HAPPINESS.