However, I don't believe that this means too much, because in real life, you'd have context to help you out and you probably wouldn't be using logic to determine if a smile is real or fake since you would be in real time. Not knowing ahead of time that half the smiles will be fake, I would probably be more likely to assume that they are genuine. And even if they are fake, being wrong about it is not likely to cause me harm. A fake smile is still a smile. At least they are trying to show a positive emotion... I don't remember the last time I put my life in someone else's hands based on if their smile was genuine or fake. You can flash me a fake smile as much as you want, but you're only fooling yourself.