There is a family run Mexican restaurant down the street from where I live. Recently I was having dinner there one weekend and my waitress was a girl about 13 or 14 years old. She was very nervous and obviously new to the job. Presumably she was part of the family that runs the place and was doing the job to get some spending cash.
It was pretty adorable because she was flustered when I was trying to place my order. One of the ladies was behind her watching while she was learning on the job and we shared a brief smile.
After my meal I pay my bill and she brings me the change. I pull out a twenty from my wallet and tell her "this is your tip". She absolutely lit up like a Christmas tree, to her that twenty was like winning a lottery ticket.
I must say it did my heart good.