But more obnoxious is when the security system of any store (I don't know how this is called in English) goes off without any reason each time you pass through it. It happened to me LOTS of times and I never knew which garment was the responsible, but my mother thinks it was my trainers.

Nowadays I can go in and out without making go it off; I have new garments and different trainers since the beginning of the year and I don't care which of them was "making me unstealthy".