http://www.bbc.co.uk/science/humanbody/mind/surveys/smiles/

19/20. The sneaky bitch old lady faked me out.

18/20. The eyes never lie.

15 / 20 ... they eyes have it...

Sneaky old lady got me too, she's so creasy.

18/20-- i missed on two males that I thought were fake, but were genuine

I bombed, badly enough that I don't want to post my score. Oddly enough, I found that I believed most of the males, and distrusted most of the females. Perhaps that means something?