You know how when you're sad or mad or something, and some clever one's like, "You know, it takes 34 (or however many) muscles to frown and only  to smile"? Do you ever think, Well then frowning would burn more calories wouldn't it?
So is frowning good for you? Like how they say shivering burns calories.
I'll try that one out next time someone tells me to smile: "It's my new weight-loss program" I'll say. You should try it too, smiley.