did you know that the act of smiling, actually sends little happy endorphins to your brain, making you then believe you are happy? even though you may really not be.
so i guess if your having a bad day, just flash your biggest smile.
its contagious, its the best medicine. not to mention that people are attracted to those who smile ;).... and are naturally drawn to them more than anyone else in the room.
and its proven! look it up!