HEY! You Dropped Something!!

A few days ago I was sitting outside enjoying the temperate weather and all of the pleasant visual stimuli that the day had to offer.  Others were outside enjoying the day too, including one adolescent boy who came riding down the street, obviously in his own world, oblivious to the fact that there could be someone other than himself on the street.

As he came nearer, I noticed his left arm make a downward swinging motion which was followed by  a loud *SMASH*  ....the distinct sound of glass shattering against the pavement.

The boy continued to cycle along so I called out, "Hey!"  He didn't hear me so I put on my best gruff voice and called out with a louder, "HEY!" 

When I finally had his attention I said, "You dropped something."   His response was , "Yeah, I know."   He then turned around and went back to the glass and began to gather the larger pieces of the broken bottle. Instead of waiting to see what he would do, I promptly provided him with a bag for the fragments he had gathered all the while hoping he wouldn't cut himself! 

I felt like giving him an impromptu math lesson that would have gone something like this:
   
Broken glass + YOUR bicycle tire = walking your bike home.