So like many of you, I couldn't for the life of me figure out the C smile versus the U smile. I finally figured it out, and it seems a little lacking. I added a personality analysis to my own version and it never ever fails.
The way the game works is you look at the shape of their smile. Does their smile elongate into a V shape, or is it short and stubby making the shape of a D?

If it is a V you say: Your smile is very interesting. You seem to smile alot. You smile in pictures, when you meet somebody, etc. The thing is, your smile isn't genuine. You smile when you are not feeling it also. Although you may always smile on the outside, your not always smiling on the inside.

It it is a D you say: Your smile is genuine. You smile when it means something, not just because you want to look cool. The problem is that you smile less often than a V smiler. Because your smile is so genuine, it would go against your nature to smile when you don't mean it.

If they give you puzzling looks ask: did i say anything that isn't true?

before you do this, cold read the person. If they never smile and are fucking emo, use the D smile. If they are cheerful motherfuckers, use V smile

Still hasn't failed me yet!

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Be who you want to be.