You're Never Fully Dressed Without A Smile by Harry Connick, Jr.

Hey, hobo man
Hey, dapper dan
You've both got your style
But, brother, you're never fully dressed
Without a smile!
Your clothes may be beau brummelly-
They stand out a mile
But, brother, you're never fully dressed
Without a smile!
Who cares what they're wearing
On main street or saville row?
It's what you wear from ear to ear
And not from head to toe
That matters
So, senator
So, janitor
So long for a while
Remember you're
Never fully dressed
Though you may wear your best
You're never fully dressed
Without a smile-
Smile-
Smile-
(spoken)
Smile, darn ya, smile!