The origin of the day is unknown, but the idea of it is wonderful. A smile can be contagious, and in this world with so much hate and fear, we all need to spread the smiles a little farther.
I am often guilty of forgetting how to smile, and as a result I bring my own mood down. However, the minute someone makes me smile, everything feels less bad. So, whatever makes you smile, do it, or think about it.