Idea

You know how when you wear earphones, you can hear the sound coming from your iPod or cell phone or whatever, but others around you can't hear it? Well, I wish there were some sort of device you could wear around your mouth and speak into, so that only you and your correspondent could hear your voice. You'd never have to worry about bothering others or being overheard when talking on the phone in public.

Wouldn't that be cool?