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

Try it out, take the quiz. It's only 20 questions...showing 20 clips of people smiling.

I got 18/20 correct...but only since I have read about spotting fake's before. Try it twice..do it once. Then read the wholeeee end bit and try again. Your score will improve by a lot I bet.

Little fun quiz..and a useful skill I'm sure someday.

Haha, here's a little hint in small letters for you all. Don't read it before you take the test at least once though!

Watch for crows feet in someone's eyes...without them it's fake

Yeah, it's a 50/50 chance if you don't know how to spot them. They all look so real.
Cool test though...really interesting.

I wonder how they got people to smile for real...probably had them watching funny clips or something. Probably some comedians.