To require mobile phones containing digital cameras to make a sound when a photograph is taken.
I guess the idea is to warn people in case some nasty person was taking a photo of you in secret. I don't know about you but the world, and especially the mobile phone, is noisy enough already. Also there are compact cameras the size of a mobile, will these be the next target?
Frankly I think Mr King has a tadge too much time on his hands.