We all know

All the saying people have about a smile such as
A smile is free so why not give it away?
smile it is the key that fits the lock of everybody's heart.
Today I had a very bad day but I had to get a lot done.
Today a smile from a business man stuck in the same traffic jam as me put me in a better mood.
A smile is free and it is very powerful, smile at the next person you see, see what reaction you get.
Ohh and it was not because he was cute ;-)