Geektastic: I had some fun in Australia on a flight back from SE Asia to Wellington via Sydney.
I was randomly stopped for an explosives search with the swabs - and then had to explain that 3 days or so before I had been working with UXO Laos destroying munitions left over from the Vietnam war. Although I was only there taking photos, there was C4 all over the place!
Fortunately it did not show up in the swab, but it did give me kittens for a moment!
A former colleague of mine was a Navy Weapons officer. He got pinged by the explosive swab check a couple of times!