There's no real cure for stupidity that doesn't include
The Darwin Awards .
I use a combination of sneakiness (cameras with waist level finders, etc.) and the 'stupid' approach (set up to take a picture, wait for the subject to walk into the image area and press the release).
So far, I've never been challenged but, hey, I've only been doing this sort of thing for forty years, so there's plenty of time yet.
