At one point in my career, I was responsible for supporting the company's application development office in France. On arrival at Roissy, my luggage went into the X-ray scanner and, on its arrival at the other end, several gendarmes surrounded me, with exhortations to "Put up your 'ands", while pointing their mitraillettes at me. The customs guy rummaged through the case, and triumphantly produced several reels of half-inch computer tape, at which point the gendarmes lowered their weapons, and explained "Sorry, they looked like magazines for a Kalashnikov"....