We're about to start reading The Curious Incident of the Dog in the Night-Time by Mark Haddon. The main character in this novel has Asperger's Syndrome, which, among other things, makes it hard for him to read and understand other people's facial expressions.
I recently came across this quiz in The New York Times which measures one's skill at reading expressions. Take the quiz and see how you do. Make a note of your score--I'll want you to have it for class.