We went to a restaurant attached to some hotel for lunch. The food was increadibly cheap, and the service from the waitresses very friendly. After the meal, we asked one of the waitresses for some recommended places to visit in the few hours we had left in Tianjin. Well, she said that she was due to knock off work shortly, and would be happy to show us around! That was it, she took us to see the sights and even arranged a taxi for us driven by one of her friends. He wouldn't accept any money from us.
It was wonderful for her to have done that for us. All she wanted to do was treat us as special guests in her home town, irrespective of the fact that we had merely walked into the restaurant where she happend to be waitressing.