I try to do things like this when I see a need. This thread is so inspiring that others do it also. On the other side, I was in a grocery line the other day and got to talking to some college kids. When I was getting out my money, the cashier told me that the college kids had said they were paying and not to take my money. I only had < $10 worth of groceries but it made me so proud that some mothers still take time to teach their sons to do things like this also.
PS: I did have the money, they were just nice kids.