Smile!

it's a sort of a little experiment that makes people happy...at least for a moment...
Smile at people on the street as if you were happy to see them, even though you don't know them or you to want to engage in any conversation with them...
I have tried this many times in many countries, when I am in a good mood(otherwise it doesn't work),....and most of the times people have smiled back or said hello and passed by a little happier... I am talking about the people that walk observing the nature and the people around them...not about those who walk but are in their own world...
the 'results' of my 'experiment' are consistent throughout the countries.... but the reactions are different according to the age of the people you're smiling to....
the happiest of them all were the older people... you can see them shine and most of the time they say hello or something nice in return...
...and maybe you forget it was an 'exercise', get into the spirit and be more happy yourself...