Beautiful 
This teenager was filling up his Mustang when the older gentleman pulled up with his can for the mower and was patiently waiting. The teenager noticed, pulled the nozzle out, and said “Sir will you please let me see your can?”
He filled it up as the older gentleman objected. When the kid finished, he put the nozzle back into his car to finish filling up his own. He refused to take money from the gentleman and wished him a wonderful day.
They are all over this country and they come in many shapes and colors. Teach your children to be like this. It all starts at home with the parents. Be a parent, not a buddy.