Next time you go out, smile at someone, they will smile back. Regardless of how you are feeling. Whether you be on top of the world, or whether you are feeling low, smile. Your smile can have an effect upon one's mood and instantly lift their spirits, even if it's only for a moment, it helps. For me, a random smile produces a random warm sensation. A feeling of appreciation, a small feeling of care, of being noticed. A subliminal message, 'have a good day', 'hope you're ok', 'you are human', 'you do matter'. A smile costs nothing for you but is priceless for the person on the receiving end. Smile, and be smiled at in return. Being on the receiving end of a smile can brighten up someones day. Smile!