Smile, though your heart is aching.
  Smile, even though it's breaking.
  Though there are clouds in the sky, you'll get by...

  If you smile through your fears and sorrows,
  Smile and maybe tomorrow
  You'll see the sun come shining through.

  If you just light up your face with gladness,
  Hide every trace of sadness.
  Although a tear maybe ever, 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 worth while.
  If you just smile, come on and smile.

  If you just smile...
Not sure exactly who does it or what it's called... if you know, please let me know.