Diamonds alongside the road

When I was a child, me and my mom, we used to go for post-prandial walk after our dinner. We never talked much during walk...
When I was a child, me and my mom, we used to go for post-prandial walk after our dinner. We never talked much during walk so one of the things I always enjoyed was to play with one of the street dogs. I always liked the cold breeze touching my shoulders. In that dark environment, every time a vehicle passed by, plastic things like carry bags, broken plastic things, those used to shine light. And me being small, I used to think that those shining things are diamonds, so I used to go close and try to pick it up...