Lazyweb request: wristwatch phone ringer/buzzer

I wish I had a device that I could wear as a wristwatch that would have a silent buzzer to alert me when my phone rings. There are buzzing watches for deaf and hard of hearing people. It would solve a couple of problems: 1) even if you put your phone on vibrate, it has to be on the right kind of surface to be silent. Even in my backpack it sometimes makes a racket. 2) If i silence my phone for a particular event, I usually forget to return it to its alerting settings. 3) At every group event, someone has forgets to turn off their cell phone. We all do it. With this device, it wouldn't be necessary to ever have the ringer on. With a wrist buzzing device, i could be alerted silently, without anyone else knowing; i could shut it off easily (if a repeated notification was even necessary); and it could be part of my daily outfit. In my perfect world, I imagine it as a kind of patch that I can attach to the back of any watch.