think about this

HAPPINESS

Rerun - rerun - rerun ...from 2003:

Do you smile with invisible ink? I mean, do you feel good about things and not share that feeling with others? How will they, too, smile if they don't know you are smiling inside?

One of the best ways to boost our own happiness is to surround ourselves with people who are happy themselves. Happiness is contagious.

And one of the best ways to make people around us happy is to be happy, because happiness is contagious.

So to boost our own happiness, we need to shine happiness on people around us, because -- you guessed it -- happiness is contagious.