As a moderately militant pedestrian I am often shocked by the diabolical liberties that some drivers take. This about putting power back into the hands (or gloves) of respectable, and oft-wronged, walkers.
"Smile for the Hand" is a glove that you wear while walking that houses a slim digital camera
in the palm. This probably would need to have to have a recessed lense to avoid scratching, due to day-to-day wear and tare.
To take a picture you present the palm, stetch your palm into a "stop" gesture and hear the "I've got it" notification once it takes the picture. Using the stop gesture should also ensure that your palm is instinctively pointing in the right direction. The picture would have a timestamp.
It is intended for those times when you need a picture taken with as close to zero response time as possible.
The examples I'm thinking of are when a car has just barely avoided running you over on a marked pedestrian crossing (a zebra crossing in the UK), has just run a light or is parking somewhere incredibly dangerous.
A USB lead would recharge and transfer pictures from the glove. An optional second, matching glove could also be sold possibly to assist with supplementary hand gestures ...
The obvious alternative would be a constant working extreme sports personal, head mounted video camera but this is for exceptional events not a constant video diary.