Mood-sensing lights warn other drivers when you're cranky

We've looked at Affective Media's experimental technology designed to let your car sense your mood and try to alter it (i.e., by playing soothing music if it thinks you're angry) and have questioned how effective it could really be. However, we do like the idea of the mood-sensing lights in Toyota's prototype Pod car, which change color based on how you feel. Instead of trying to get you to chill, the lights warn other drivers when you seem a little unstable, letting them know they should give you a wide berth until you calm down a little.