Browsing through Wikipedia sort of day.
Ran across this number in the "smile" entry - can you
pick the real smiles?
I got 18 out of 20, which I didn't think was too bad (though maybe not good enough for someone who wants to study face perception - I wonder how I'd do with monkeys...).
It's an interesting test - they seem to vary the temperment and expression independently (a guy with smile lines around his eyes might give a false smile, for example). I found myself smiling reflexively at many of the images, though I didn't actually take note of whether I was responding more to fake or real smiles (that would have been too much forethought).
The little summary at the end made a good point, that being bad at picking real smiles probably facilitates social interactions (if you don't know they're putting on a show, you'll think they're really smiling at you and thus respond more positively).
Anyway, I have a new favorite 19th century French scientist (sorry Broca) - Guillaume Duchenne.
Neurologist, facial physiologist, medical photographer, the guy on the left.
(And this is not even the most disturbing of his images...)