In my opinion may make you grumpy.Firstly, on the moment you will be sad or mad about the bad experience,but in time it will be an experience that will mature you and that will help you build your personality.Secondly,i think we should feel sad because if we aren't sad at the right time we ll regret it.
In conclusion i think a sad experience may be constructive if you understand that in order to recognive the sun we should know the dark too.
