Wearable Mobile Phone (Score 2, Interesting)

Wearable phone with head up display, bone conduction headset and twiddler like 'keyboard' would allow non-disruptive use at theaters, etc..

It could work like this: You get call. You hear it on your bone conduction headset and see on head up display. You type replies with twiddler and synthesizer converts text into sound and sends it to the person at other side.

Other people might not even realize you have wearable phone and are 'talking' on it, see modern wearable computer example here.

Downside: Don't see anybody with above like product out ... yet.