Here's another story for you Compylot. I once purchased a set of bike lights for my pushy/racer and it specifically said on the box to not take through airport screening because it (the battery) will look like a bomb. I read this warning after having boarded the aircraft.
My ELT beacon usually raises a few eyebrows when it goes through. When my flying bag goes through with ELT, hand held radios, torches, headsets and GPS, I can guarantee I'll be randomly selected for some kind of thorough search.