We can't live without humor.

One teacher taught me once that the smile is the most wonderful action that we can do, because this means that you are cheerful.

However not always can't suggest the truth happiness.

On the one hand , we smile to not show our bad sense ,as a result not divulge it to important persons ; perhaps it could be to don't make it worry, o simply because we aren't glad to talk with them.

On the other hand, one big thing happens to us and we aren't in our best state, and this is why we need humor in our life to succeed ourselves, likewise when a child i's crying and you give something to distract him and stop crying. 

In conclusion, I strongly belive that we need humor in our live, to brake the simply routine and be more optimistic!