It was in last summer. I remember my careless attitude. I would always ride a bike around the city and left the bike behind. I never, not even once, worried about having it been stolen, and it was always there when I returned. I didn't know how it worked. But then one day I rode a bike to a grocery store with my friend. He was rather panicked that his bike would be stolen - his bike was rusty and old but mine was rather new. I told him to calm down and not to be worried, but he was. When we had finished shopping. We found his bike was stolen and luckly mine wasn't. I find it very amazing.