At Vitensenteret (science center) in Trondheim they have a web cam hooked up to a TV screen where they show a live view of some face scanner software (multiple faces simultaneously). It estimates your gender, age, and mood (happy, sad, angry, surprised).

Every time I've visited it's been quite accurate on me, my friends, and on the other visitors.

EDIT: here is a pic of what I'm describing: http://fredly.fhs.no/dancemixbloggen/wp-content/uploads/site...