Did I mention the "ugly shirt" thing?  In William Gibson's novel, Spook Country, he describes a piece of clothing in a particular color (Klein Blue) which is virtually impossible to record on video--something about digital recording technology triggered to not record a particular group of pixels or something like that: basically the clothing, sometimes called an "ugly shirt" is something of a covert operations cloaking device (people see you when you're wearing it, but security cameras don't).  that's not what you were asking for or about, but still, it's an interesting tidbit.  (Of course, Gibson's "ugly shirt" is an extrapolation, based on the phenomenon of smart clothing, and apparently a reasonably good (as in not-awful) cloaking jacket has been developed and tested.  It doesn't exactly work, but it doesn't fail miserably either.