Written by the "Little Tramp", Charlie Chaplin, a wonderful message, done by many.
This happens to be the Jimmy Durante track.

Smile even though it's breaking.
When there are CLOUDS in the sky
you'll get by.
If you smile through your fear and sorrow
Smile and maybe tomorrow
You'll see the sun come shining through
For you.
Light up your face with gladness,
Hide every trace of sadness.
Although a tear may be ever so near
That's the time you must keep on trying
Smile, what's the use of crying.
You'll FIND that life is still worthwhile-
If you just smile.
That's the time you must keep on trying
Smile, what's the use of crying.
You'll FIND that life is still worthwhile-
If you just smile.

Hope I have caused a smile or two or more.