Involuntary Happiness

For me, the best kind of smile is the one you can't help giving. It's the kind that pulls your mouth up like magic and you feel the involuntary stretch of your face. This is the most natural kind of smile; it's a smile of pure pleasure, satisfaction, or amusement. There's no thinking; there's no force. It's as natural as our heartbeat. I see no reason for not enjoying it; it's one of the best feelings in the world. A natural pleasure. One of biology's many gifts.