Many of you will have probably seen this (e.g. on Wired), but just in case you haven't, Rod at Reasonable Deviations has a discussion of Julius von Bismarck's device, which looks a bit like a camera with a speedgun mounted in the back of it. Camera flashes when other people take pictures set off its own flash unit, which fires through the image on film in the camera, projecting it onto whatever the camera is focused on... like a kind of instantaneous graffiti - it's too brief to be seen by eye, but it shows up in the shot.
I'm not sure what to think of it (aside from, "Damn, that's clever"), but I can see the potential for a lot of shenannigans of various kinds.
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