If you feel a bit gloomy,  
put a smile on your face  
it will help to cheer you up  
and is no disgrace.  
Smiling at someone  
makes your world a brighter place,  
and if they smile back,  
you’ll be surprised how good you feel.  
Therefore, the advice that  
I am giving you is easy,  
to feel good within yourself  
put on a happy face.
David Harris
http://www.poemhunter.com/poem/a-happy-face/