The BBC has a short test to see if you can determine fake smiles from the genuine item. There are 20 smiles to judge after completing a short questionnaire. It’s fun and challenging and will take 6-7 minutes.
NewMexiKen managed to get it right 15 out of 20 smiles.
I got 17 out of 20 and I remember debating on the three that I got wrong. That’s about in line with what I expected to score going into it.