I've often travelled with a harmonica pouch in my bag that must have looked like an ammo magazine to an X-ray machine, but I've never been pulled up. I had difficulty at the Colosseum in Rome last year. After I'd queued in heat for two hours to get in, the scanner revealed the G harp in my bag. I had an almighty row with the security man ,who wasn't going to let me in. I told him that I'd play him a tune. He declined that offer, then, looking furtively around, he told me that "he hadn't seen it," that I could go in but on no account was I to play music. Great days!